you can get a .bit domain name with namecoins
Then why are all the bitcoin entities (coinbase, bitinstant, mtgox, tradehill, bitcoin foundation, bitcointalk, etc) using ICANN's gTLDs?
![Grin](https://bitcointalk.org/Smileys/default/grin.gif)
because the .bit doesn't use standard DNS service that all web-browsers go through. so unless you have changed a few settings in your web browser, you wont easily get to a .bit address.
and trying to get potential millions of customers to change settings just to visit your site, is a headache for them. so unless you sell someone unique, customers wont visit a .bit website.