Well, mining has just become extremely profitable. I had fear that with the difficulty rise, people would move their GPU to other alt-coins, but with ASIC lagging, the price rise is way higher than difficulty rise.
I remember starting FPGA-mining in January (custom design re-using telecom cards that I have here at my job for free, with big FPGA) at 500MH/s, jumping to 2.2GH/s in Febuary. I told myself there's no point in adding more hashing power as ASIC would come and it will just become less profitable. I then waited for BFL 60GH/s SC as my next mining platform. But at the time, I popped a bitcoin in 3 days, worth like 12~15$/day. Now, even though difficulty has doubled (I now pop a BTC in 7 days), with price rise I now make 35$/day (That's a little over 1K$/month). So I just bought stuff to add 1.2GH/s. That will be 45$/day and continue rising
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I think a lot of miners, especially GPU miners where power cost is much higher than FPGA, are really happy continuing mining BTC. Especially looking at LTC flopping the last few days on the exchanges
Run Bitcoin... Run