The main reason for me would be because I'm a newb and have 0 BTC at this moment
I'm also only interested in BTC IF I can make some money with mining, which all depends on time.
when the whole ASIC development takes to much time, say another 12 weeks I think we will all be to late because of the fast rising difficulty
I do not want to buy the chips with BTC, I'd rather spend USD for the chips, I don't want my money to be stuck in BTC.

You can not buy a loaf of bred with BTC yet