I could, but the signalling of accepting this deal seems bad since if you don't have $200 to spare right now it seems unlikely that you will have $49,000 within the next year. One HD 5870 definitely isn't enough to generate that many Bitcoins.
I have over 200 USD now, I just wanted someone else to finance it.
Now you can donate to Singularity Institute using Bitcoin.
Currently Bitcoin mining appears to be profitable as only bubble economics can be. Already some Less Wrong users have purchased GPUs and started mining Bitcoin. Please consider sending some Bitcoins to SI at address 1HUrNJfVFwQkbuMXwiPxSQcpyr3ktn1wc9
2014 Edit: Please donate Bitcoin by using the Bitpay link on MIRI's donate page. Thanks!