Also a lot to do with inflow of online ad dollars in finance vertical..look at bankrate.com earnings/stock history.. btw, speaking of minimal functionality required and just doing what is necessary for successful business - look at bankaholic.com which was acquired by bankrate (On personal level Johns Wu might have made near about equal if not more money as Mint.com founders -- given it was profitable company). Also, that is even better story compared to this -- Bankaholic gets millions by paying $0 for WordPress.