I am tired of reading blog posts from "bubble predictors"
jordancooper.wordpress.com
jordancooper.wordpress.com
The internet isn't something that needs to be tamed. You don't have to quiet all the people who have opinions. You don't need to correct people when you think they are wrong. Have strength and just walk away.
Someone is wrong on the internet!
* sticking up for the law of supply and demand because it currently favors him, and
* criticizing producers of startup financing for complaining about supply and demand when it disfavors them.
The investments people usually associated with bubbles (stocks, real estate, gold, bonds) are all published widely. Helps fuel mania. I know sophisticated investors who have no idea how angel investing works and have never heard of Y-Combinator. Doesn't sound like bubble conditions to me.
There's a key difference, though, between this situation and one conducive to bubble formation: the successes of the deals aren't correlated. The success of one startup doesn't make the next more likely to succeed. It may cause the next to attract more investor interest, but once it gets going it still has to succeed or fail as a business. Thus the valuations are still ultimately grounded in reality. Also, it's not the case that a startup is passed from owner to owner the way that, say, real estate is.
So I prefer the alternative explanation that we as a society are simply getting better at nurturing startups. (I.e., I'm agreeing with you.) That certainly is sustainable.