Personally, I wouldn't put too much "trust" in the market cap number. A lot of times at this stage, the investing is rather speculative. We will find out what the market really thinks in a few months.

I imagine people are probably buying the stock in the hopes that this is the next Facebook (which is now roughly 4x the initial day end trade price). There's also, however, the possibility that this might be the next Groupon IPO equivalent (initial market cap at the close: 16.5 billion; current market cap: 2.34 billion, about 20% of the initial opening day price). We'll see.