But i don't know why we can't see 100$ again or even less?
Bitcoin is money and investment at the same time, because bitcoin values today more and it can value tomorrow higher so something that has a different value through the time i consider that as an investment asset so bitcoin is.
Bitcoin is of course an investment as there are many currencies which can take care of us on daily basis, but this investment is something different from others.
If a person put some money in bitcoin and the goal is to make money, that is an obvious investment. But you know bitcoin was not made just to make money but rather the technology behind it including anonymity, less hassle transaction and ability to touch far away place in just one click that the usual money tranfers doesn't have.