Got the invite today and pointed a few miners here. Bought a few shares just for fun. Seems to work very well.
Just wondering, long term, why would someone want to buy shares with BTC? I can imagine someone wanting to exchange currency this way (ie using USD to buy shares -> BTC), but having BTC as the only payment method doesn't make sense to me. I guess the one thing I could think of would be someone buying shares to test out a new pool that they've created? Or you're just feeling lucky?

Obviously I'm missing something here.