Proof-of-work crypto prices are based on 1) mind-share 2) sentiment/momentum 3) institutional backing (hedge funds and companies legitimizing them) 4) price of electricity 5) cost per hash 6) hardware supply 7) legality/illegality/regulation. Proof-of-stake currencies only lack #5, cost per hash. What I'm trying to say is that there's components to the price that can drive purchase/sell decisions.