Why dont you try putting a little bit into a group buy? There are quite a few out there and some are a little dodgy, but some are the real deal and you can make quite a bit of money if the market favours Bitcoin.
Check this one out
http://ultibit.com. Its a legit group buy operation.
Else if you have enough, maybe buy your own ASIC rig... Although thats a much riskier option cos if it fails you lose much more...
I wish you luck though, wherever you choose to invest your money