Imagine if Joe Schmo reads an article on the home page of the tech section of "his Yahoo" about this new investment vehicle, decided to put all of his 401k money that as safely placed in low-load index funds into a YC fund that didn't particularly do so well when the fund finally matured and he cashed out. I've seen people pissed off at losing 10 bucks on Kickstarter prototypes-- imagine how pissed off Joe would be that he lost 200k because he wanted to "get in on this Web 3.0 stuff".
Those accredited investors regulations do more good than harm mostly because people in aggregate are greedy and don't read prospectus' in their entirety. Most people didn't even read their mortgages in 2007 (or now for that matter, even after the systemic ..situation of 2008), look what happened there.
If you're living in SF and married to someone in tech, odds are you make enough to qualify as an accredited investor anyways-- the per annum barrier is pretty low.