Its fine, capitalism cuts both ways. We shall see if the bankroll can withstand being squeezed out by smaller 92% offers. My guess is that it takes a toll.
Depends what he's doing with them. If he can effectively liquidate at 98%, even buying at 95% would be worth it.
For many people, paying over 92% instead of buying from PPDG or Staples, getting 5x Ink and hopefully some portal points, or trying cardcash or similar, just isn't worth it. It depends on the volume you're doing.