Why email? It seems like an inefficient method to deal with bug reports. Not to mention it seems like this would be really open to abuse.
P.S. They should have put the pricing information on the home page. Didn't realize they were a YC company either.
That's a worse user experience, though. And you have no opportunity to ask follow-up questions, or even say "hey, it's fixed!". That kind of customer service goes a long way.
How? Worse than what?