Business to business digital advertising fails differently from consumer advertising, and most of the failures are structural rather than creative. The buying committee has five or more people, the cycle runs for months, the addressable audience may be a few thousand accounts rather than millions, and the metric everyone reports on (cost per lead) has almost no relationship to the metric that matters (cost per closed opportunity). An agency that does not build for those four facts will produce campaigns that look efficient in a dashboard and produce nothing a sales team recognises. This page describes what the work involves, how the fees are structured, and the questions that separate a demand generation partner from a media buying vendor.
Why small audiences change every rule
In consumer advertising, optimisation works because volume arrives quickly and the platform can learn. In B2B the target may be a few thousand named accounts, and the conversion event may happen once a week, which starves the algorithms that consumer campaigns rely on. The practical consequences are specific: campaigns need longer learning windows, statistical significance takes months rather than days, and optimising toward a mid funnel signal (a demo request, a pricing page visit, a qualified account engaging repeatedly) usually works better than optimising toward a distant closed deal the platform will never see enough of. Ask a candidate agency how they handle low conversion volume. If the answer involves broad audiences and rapid creative testing, they have brought a consumer playbook to a market it does not fit.
Attribution, and the lead quality problem underneath it
The most common failure in B2B advertising is a campaign that produces plenty of cheap leads that sales refuses to work. This happens when the agency is measured on cost per lead, which they can always reduce by widening targeting and lowering the friction of the form. The fix is contractual rather than technical: agree in advance what a qualified lead means (company size, role, market, stated need), instrument the handoff so outcomes flow back, and hold the agency to cost per qualified opportunity from month one. Ask directly how sales feedback reaches the campaign and how often. An agency that has never seen your customer relationship system will optimise the only thing it can see, and that thing is the wrong one.
Channels, compliance and the email question
The B2B channel mix is narrower than consumer: professional network advertising, search on high intent commercial queries, industry publications and newsletters, retargeting, and outbound email. The last of these is where buyers most often get into trouble. The FTC's compliance guide for the CAN-SPAM Act sets requirements that apply to commercial email including accurate header and subject information, identification of the message as an advertisement, a valid physical postal address, a clear opt out mechanism and honouring opt outs promptly, and it makes clear that the sender is responsible even where another company handles the sending. If an agency proposes cold email at volume, ask how those requirements are met and who is named as sender. The FTC's general online advertising guidance is the plain language reference for the rest of the claims your ads will make.
How the fees work, and what to compare
Three structures dominate, and they are rarely compared like for like. A flat monthly management fee is predictable and easy to compare across candidates. A percentage of media spend scales with budget and creates a mild pull toward larger budgets, which is manageable if you set the ceiling. A hybrid with a base fee plus a performance element is common at larger spends and needs a written definition of the performance metric. Independent of structure, ask which functions are in house (strategy, media buying, creative, landing pages, analytics), what the minimum engagement is, and who specifically will work on the account rather than who is presenting. Buyers frequently shortlist specialist demand generation shops alongside full advertising agencies, so hold both to the same disclosure standard before comparing the numbers.
Questions people ask about b2b digital advertising agencies
What minimum budget makes B2B digital advertising viable?
Enough media to accumulate meaningful conversion events within a quarter, plus the agency fee on top. In expensive professional categories that is a large number, which is why underfunded programmes fail so predictably: they never reach the volume needed to learn anything. Work out how many conversion events you need to judge the test, price them at current market rates for your queries, and be honest about whether you can fund three months of that.
Should the agency also handle the landing pages?
Usually yes, or at least have direct control over them, because a media team that cannot change the page is optimising half a system. If your web team owns the site, agree a service level for page changes before the campaign starts. Campaigns routinely stall for weeks waiting on a page edit, and the media budget keeps spending while they wait.
How long before we can judge the programme?
A quarter for directional signal and two for a fair verdict, given B2B cycle lengths. Judge month one on setup quality: tracking correct, audiences built, negatives added, pages live. Judge month three on qualified pipeline created rather than leads captured. Anyone promising a clear verdict in four weeks is describing a consumer market.
Do we need account based advertising specifically?
If your addressable market is small and your deals are large, yes, because spending broadly is simply wasteful when you could name every worthwhile buyer. If your market is thousands of small businesses, account based targeting adds cost and complexity for little gain. The size of the deal and the size of the market decide it, not the fashion of the term.