A company for whom $130 is significant today is not necessarily a company for whom $130 is significant tomorrow. One thing we want to do is lower the barrier to people trying out their ideas, and for those ideas that turn out well we've gained a large customer. For those that don't go well we (and our user) basically break even.
And as well as being a home for the casual weekend project, we have a number of users processing millions of dollars a year.