Given that "home runs" for VCs pay out 1,000x to 10,000x, and that IPOs have much tighter restrictions than in the 90's, it seems fine. Even if it's a bubble, who is harmed by it? The VCs are shouldering the risk. Those who put their money into a VC fund know that it's high risk. Everybody is aiming for the 1,000x return, and it may not be possible to get one without making a lot of risky bets.