This market price is truly amazing.
Using next-gen hardware that ships this January, it is possible to mine bitcoins at 600GH/s, or roughly 50 days between mining blocks of 25 bitcoins at a time. If someone were to invest $20,000 into buying 4 of these, it would on average take 11 days to pay off all the equipment and after it was all paid off, average monthly profit would be $58,899.17 or $568,863.53 a year profit. This is after electricity cost is considered.
If the market were to drop back to what seems to be it's stable price of $200 USD, profit would still be $112,300.02 per year.