I don't understand how this is immoral. Everybody knows that everybody is just in it because they hope someone else will come along later and pay more for a coin than they did. Who cares about pump and dump and pyramid schemes? Someone dumb enough to put money she/he can't miss into the system is probably also dumb enough to put said money into a gambling machine or any other scheme (prince from Sudan?). Meanwhile people have fun and true innovations may come out (the crypto of monero/zcash combined with the master-node structure of DASH or a Tangle based system like IOTA). Why all the emotion? Literally everywhere on the internet and classic media people say: Don't do it, it's a bubble. If people can't listen, they need to feel, if you don't allow people to feel they become unhappy anyway, they may even be driven to TOR based decentralized exchanges where they are even more likely to get schemed.