If people are going to trust their accounting to you to provide you with test users, I think you should at least provide the first 10 or 20 test clients with a free service for a year. Changing accountant is a big deal and so "one month free" is not much at all.
Good point. Changing accountants is a big deal. In fact, one of the goals of this potential startup is to make it a much smaller deal. Nonetheless, we're not necessarily looking for someone to change their accountant with this exercise. What we want to do is test our process with some startups, and in return, we'll provide them with a new (and hopefully valuable) perspective on their finances.
That being said, we're open to any ideas, and when we speak with the startups we might be doing this for, we'd be happy to discuss any possible arrangements in terms of duration, etc.
If people are going to trust their accounting to you to provide you with test users, I think you should at least provide the first 10 or 20 test clients with a free service for a year. Changing accountant is a big deal and so "one month free" is not much at all.