Tried to reply already, but something failed. Wouldn't even let me re-paste what I had wrote. Because I had "already posted it". Can't be bothered writing all of it again. Haha! Basically....
When ASICs hit you will be lucky to make a penny per year.
I was looking at the BFL ASICs, and according to my calculations (using
Difficulty * 2^32 / Hashrate
equation), the 1,500GH/s device would pay for itself in less than a month, with a difficulty of 10,000,000. Even at 20,000,000 it would take less than 50 days. Lets say 60 days including electricity. Hell, increase it to 30,000,000 and its still only 2 and a half months. 100,000,000 and its still less than a year. [assuming the exchange rate stays constant (i know it wont), and that the reward stays at
BTC25].
Its a huge investment to start with ($29,899 for now), but do you think its worth it? Even the 4.5GH/s mini device seems handy.
What do you think? Stay away? Or start pulling my change together, and order one?