during the first bubble i bought about a hundred bitcoins (2k usd worth), just after few days the bubble unfortunately popped and the price was back to 4-5, and i decided to sell them (it was my first "trading" experience, the stress of the losing was high), after a while (late 2012) i bought back what i had left for $9 and sold them for $13, now I just wish that I kept them instead when i bought them initially :-(