Yes I do. I've sold my house and been buying at $5, $10 and $13 but I'm a reckless student now so I can afford to lose it all.
I did some mistake daytrading so now I'm only buying and holding.
Never invest what you can't afford to lose. If you're risk adverse try to diversify especially if you have a family to feed, a mortgage or near retirement. Even if I invested some money with BTCST and GLBSE I've been lucky enough to withdraw just in time. This taught me that most bitcoins should stay untouched on a paper wallet. Now I'm keeping away from
all "investing" opportunity denominated in bitcoins.