Not surprising... the benefit of getting accepted is getting face time for advice and networking with potential investors at their dinners, etc., not the funding.
If they said yes to that, there'd be no need to apply, we'll all just show up at Graham's house every day.
Are you asking if YC charges potential investors to attend their demo days?
Interesting if they did... part of YC's function is to introduce follow-on investors to their startups, but I've never thought about their charging investors for that privilege.
Who says there's no business model in the Web 2.0 world?
That is entirely the wrong way to respond: you will get a lot of that (from VCs, prospective clients, etc.) and dealing with it like that is guaranteed to lead you to failure, simply because everyone will come to see you (rightly or wrongly) as a complete prick.
If they said yes to that, there'd be no need to apply, we'll all just show up at Graham's house every day.