It is hard to prejudice even if there's a spring of so many coins,I can't say that its dangerous because all of this coins has there own project too so,if we will holds any of this coins in which we cannot predict also when will the value rises,we can still gain profit of the coins that we have if time will come,sometimes it takes so long but if the market will rise then you can have enough profit from it,so it is not dangerous as it is.