There's a difference between being presented with stats and a company's homepage which is designed specifically to get you on board. It's not that I don't trust anything I hear, it's that I assume that a company is cherry-picking the best anecdotes.

But there are ways to present information that don't seem stupid. In particular, Basecamp is doing two things here that are misleading. First, they're not actually presenting data, they're presenting anecdote(s). Second, they're presenting them in a medium which should be viewed with extra skepticism.

I don't want to know what percentage of your paying customers like you (seriously? 3% of your customers use you but dislike your product?). What I want to know is what specifically you do and how you do it. Everything else is noise - and so the entire page is noise.