Most people are doing pool mining.
On BFL website i quote "Processing Power: 5 GH/s (+/- 10% running variance)". The miners i got are doing 7.5GH/S (I'll post images of a miner i am running if anyone asks for it).
as for the exchange rate, last night it went up to 900$ while now its 553$ (It was a few cents 4 years ago).
In summary, don't buy an ASIC miner unless you believe in the future of bitcoins. People used to mine 10 bitcoins/day when the price was in cents. For some people it wasn't worth it, for others it was. The bitcoin reached 900$ yesterday night.
My point is: 0.1 bitcoins maybe worthless for some now. But in the future it may be worth thousands (Or null).
@rtp
Actually i am doing both. Mining + selling ASICS for some money.