How much more credible a testimonial can you get than "I built my business in 5 hours a week, I sell bingo cards to school teachers, and I easily expect to recoup the investment I'm making in KISSmetrics"?
For what it's worth: I sell enterprise software at a price point several orders of magnitude higher than Patrick's, at a company with more employees than most established YC companies, and KISSmetrics isn't worth it for me right now, because I'm simply not prepared to feed it the data it needs or to make the decisions it's expecting me to make.
I don't take it personally that KISSmetrics is pricing me away from paying for it. In fact, I appreciate it; it's preventing me from wasting time.
If $200/mo is a lot of money to you, you either shouldn't be spending a lot of time on funnel tracking, or you don't have a business. $200/mo is below the noise floor in company with just four people at ramen wages in the Bay Area.
Personally I would never create a business that targetted other businesses that really have no money, it has never seemed a great business plan, but I would not do a beta marketing of "hey you, try this, you'll love it" to then offer a product they cannot afford.
I'm sure they will have no problems finding customers, but more of a problem finding beta testers for their next product.