I totally see your point. There's no way I could diversify my $75k enough to sufficiently offset the risk associated with investing it. A few people have mentioned investing clubs or syndicates -- this seems like an interesting way to break in.
I have my portfolio of "solid" investments - now I'm looking to grab the brass ring. I have no trouble parking my money for years before a liquidity event but I'm definitely looking to see a sizable return on investment.
I have certainly considered that, but I'm at a point in my life where I want my money to work for me - not the other way around. I'd be interested in providing capital for a startup but I have less interest in being involved in their day-to-day business.
Perhaps looks for "Small Cap" funds focused on tech or do your own research on the tech sector and buy stocks. Otherwise you are talking angel investing and I think, for a little while longer at least, you need to be an Accredited investor with all the income and net worth rules that go along with that.