Imagine a Sony toon selling gold tickets (or something valuable but not recyclable after a character uses it). Thats 100s of k of plat taken out of the economy (because of course a planted seller better be destroying the plat).
Go back and tag all the big $$$ twink items with no req level (i.e., from former raid bosses people solo farm now) as attunable. You can still farm it, you can still sell it, but the person paying for it is on the hook for the investment (AoN value as an attunable item...?).
Neither of these moves hurts regular players because making the twink gear attunable doesn't prevent you farming it for your friends or alts, it just makes it less lucrative to permacamp. The ticket rewards could be revised to be very appealling again (and attunable/no trade). You could even be kind and phase in the items with the "pending attunable" tag for a month prior to the final change --just to let people know and plan.
Best part is... at first these 2 changes would increase the demand for bought plat. The farmers would sell out and then have to work to regain their stock... but the easy 24/7 money makers are reduced in effectiveness. Do it right they won't bother with EQ as much because other games are easier to profit from.
That's my theory, any thoughts?