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 investor

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?