Andreesen Horowitz is said to be paying about twice what other VCs pay.

http://www.newyorker.com/magazine/2015/05/18/tomorrows-advance-man

‘If you have a crackerjack idea, one of your stops on Sand Hill Road will be Andreessen Horowitz, often referred to by its alphanumeric URL, a16z. (There are sixteen letters between the “a” in Andreessen and the “z” in Horowitz.) Since the firm was launched, six years ago, it has vaulted into the top echelon of venture concerns. Competing V.C.s, disturbed by its speed and its power and the lavish prices it paid for deals, gave it another nickname: AHo.’
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Mark Cuban caused a big stock market stir by saying high tech was in a bubble a few months back. But he clarified by saying he was referring to the VCs and their pre-IPO deals, which is where he probably invests a lot. My Nasdaq investments are sound as a drachma.