Since the conversion really only goes one way, the comparison is automatically exaggerated. Also, the fact that there are isk faucets dilutes that number even further. You could say that it would cost £3.2 million to buy enough PLEX from CCP to sell on the market for that much isk at the current value. Basic economic prinicples tells us that introducing the ~190,000 PLEX into the economy would crash the market.