pos coins don't need mining
the multipool is just an indirect investment...
there is no real difference between buying into a coin and mining into a coin
fiat/state money has a resource price tag
if you spend your national currency to buy bitcoin, you are pushing resources into the coin
if you mine, you do the same thing but indirectly
with pow coins however, the chain is secured by the mining
so if you remove the mining, the coin dies
with pos coins, you remove the mining and the value drops a bit maybe
but this is not essential to the currency
the value of a currency is not the currency itself