Bitcoin IS investment already!
You may think like that, but there are more investments with Bitcoins. We can trade them in websites and with some experience you can make a good profit.
Sure, I agree with that for the short term, but for the long term I don't believe anything can be better than BTC for investment.
There are two things in this earth you could invest your money BITCOIN AND GOLD you can use bitcoin to buy gold also you can sell your gold to bitcoin this is vice versa in my country or in my place it is too hard to find and sell golds so better to choose bitcoin investment trading can be done with a good income too.