Most of the time I only believe in bitcoin, because bitcoin and blockchain are our future applications.
At present, most altcoin looks more like a scam and hype, which worries me.
In my case of course I am believing because it is a positive result and I am an optimistic person which all ideas gayhered will and segregate the usage and the opinion that might needs an action. If we are talking about altcoin not all are scam yet it is still new.