The pos system is no doubt more resource-conserving than the pow system. It does not waste your computer hardware, but we all know a cost-profit method. If Ethereum uses pos, the mining costs of Ethereum will be reduced, which may affect the price of Ethereum.
Another question to pose, once Ethereum moves to a PoS system, how will Ether be generated? What will this do for Ethereum prices?
I assume youll will get a return on investment for handling block transactions. I believe it will raise prices since, there will be an increase in demand. The ETH staked will be locked up and decrease the circulating supply. Currently there is no supply cap.