Anyone who thinks they should get a salary like that when you've only raised $250k should not be your CEO. Run away quickly. Don't even try to negotiate him down.
I don't know enough about the specifics of your business to say much else, but in general, the only thing that matters is having a product people will open their wallets for. If your poc is turning heads but not opening wallets--why is that? Are you positive those wallets would open if you presented some kind of MVP or a polished product? Could you get a deposit now?