I got 2300 Bitcoin in 2011. I sold 500 at $119.99 earlier this year and bought a nice car. I sold 900 at $997 and am in the process of buying 3 rental apartments for case. I still have over 1000 Bitcoin.
Once you get Trusted on mt.gox you can withdraw $500k per month. Its not enough to do arbitrage but its not small change either.
I am not alone - lots of people have made huge profits on Bitcoin and we expect to make more. Its designed to work even if its made illegal to own Bitcoin. The price has always fluctuate violently because the markets are so small and liquidity is so poor. But its the most interesting social experiment on the Internet and I love being part of it.