Bitcoin IS investment already!

Correct, but I think OP wants to multiply his bitcoin while he is waiting, because he could have more if he is holding it, and investing it at a Investment site at the same time, but there is a risk on investing our bitcoin in a HYIP or in a gambling site, because in HYIP, most of them are always running away with all the bitcoin that their investors invested to them, so we have to be careful, or should I say, we don't have to invest our bitcoin if it just going to those HYIP sites our there.