Crypto accounting b2b tool here. We spend 90% of our time doing onboarding of accountants. 2 ppl company, before salary our operating costs are around 5%. We just have a simple Frontend deployed on heroku and then a bunch of nodejs workers pulling the data from various API. Our tech cost are probably less than 1%, the rest are tools and api cost.
B2B is cheap if you don’t do stupid things like running kubernetes :)