Because instead of MINING bitcoins, you can just BUY bitcoins.
Yes, I know.
At the moment prices are less than the cost to mine them, or about the same.
No. My margin of profit is around 50% right now on 1 Bitcoin mined. Why?
-The highest I can pay is 7.5 cents/kwh for electricity. It's possible for me to pay lower than that.
-I use Canadian dollars. 1 Bitcoin give me more $CAN than $US. Since I pay my bills in $CAN, I get more for my money. The 20-30 cents I get in bonus helps a lot.
Each day, I mine Bitcoins for 1.30$ while you buy them for 3$. It's a free world, so buy them if you want. I prefer mining them, since it's cheaper.
Not to mention that buying bitcoins instead of inflating the currency more by mining them will help to drive the price up further.
It ain't June anymore son.
The number of new Bitcoins injected is fixed. Mining more just give me a bigger cut on the 50 BTC bounty on each block. Mining doesn't influence the price at all, since the rate of new Bitcoins stay the same. The only thing mining influence is the difficulty index and the reward you get in your pockets.