I know, cards are stupidly expensive. But let's say the cards magically reduced in price by 75% overnight. Why would you buy them (other than assuming it was a blip and they'd jump 150% back overnight)? You'd have nowhere to play them and the times you could use them you'd be paying big entry fees for low EV.
Nobody will host big events with huge prizes because they'd lose money as not many would show up. Most won't buy in because it's too expensive for the EV since there's not many sanctioned tourneys with any decent prize to play in. It's the chicken and the egg, except the chicken is cooked and the egg won't crack in this catch-22.