According to Fortune, there are management fees required on the full $1.5B. It's a huge fund (same article pits the average American venture fund at $107mm), but given the fees and the assumed ease of the fundraising process, it's easy to understand why they went this far.
For all the tension between Andreessen and Icahn, they share one quality that few investors can claim. When Icahn buys AAPL and let's people know, the lemming effect allows him to profit merely from announcing his own optimism (note he doesn't sell off of this, but his shares are still more valuable). At this point, a16z essentially has the same star power. Their blessing can give a serious push to companies pursuing an IPO or acquisition, to the point that the boosted exit value overweighs any "overpaying" a16z might do on the entrance.
For all the tension between Andreessen and Icahn, they share one quality that few investors can claim. When Icahn buys AAPL and let's people know, the lemming effect allows him to profit merely from announcing his own optimism (note he doesn't sell off of this, but his shares are still more valuable). At this point, a16z essentially has the same star power. Their blessing can give a serious push to companies pursuing an IPO or acquisition, to the point that the boosted exit value overweighs any "overpaying" a16z might do on the entrance.