Quick fixes for high-level plight?

Really not seeing the downside to it dropping from bosses harder than zakum.

Zakum itself is level 50 to enter. So people will be selling these cards like they (used to?) sell zhelms and skillbooks, before Karma.
HT is level 80, same deal (once the glitch is fixed, anyway).
Scar/Targa are level 90 to enter (idk whether you consider them "harder" than zak, but they're higher level).
Pianus, Anego, Tengu, Samurai, Toad, Dodo, Lilynouch, Lyka, and whatever other free-spawning bosses you might consider, will all suffer a fate worse than Bigfoot with its toe selling.
BGA/BGB/GP don't have a level limit, as far as I know. You just need a Comb.
Chaos Zakum is possibly too hard. Not everyone 150+ can fight it. Plus it's usually attacked by parties, with all the drama of loot-order that ensues.
Chaos HT is even worse.

Rethinking Pap, I'm not so sure I agree about abuse. Is a person able to be present at more than 2 Pap kills a day? I mean, let's say I camp in the room and don't summon. You come in and, not wanting to waste an entry, kill it. I can't loot your stuff because we're not partied. Or maybe I can, not relevant for my question. Now you leave the room. Does the outside door open? Can I stay inside waiting for someone else to fleece? As far as I know, the door won't open until we both leave the room. So I spent/wasted my entry on your kill. Might as well have killed it myself and been sure to have all the loot to myself.

Nice thing about Pap is that just about everyone (except maybe bishops and people with really weak gear/stats?) who can enter the room can also solo it. So there is very little motivation to prepare an ambush.

However, I just thought of something even simpler and un-abusable.
I expect the Hunter's Luck event is still in the data. Nexon never delete anything. They can simply change the beginning and end dates, and the minimum level, and presto: everyone level X (140? 150?) gets 6 untradeable 1/2 hour 2x tickets per week.

In order to administer any 2x with a level limit, it would obviously come in the form of a cash shop equip, kind of like the aura ring. Perhaps they'd go as far to use a whole new slot just for this particular item. That'd be cool, 1.2xp accessories for level 30-120. 1.5 exp accessories for level 120-140. 2x accessories for 140+. But it feels weird, under this logic, it'd seem like 130-139would be much more difficult than 140-145 or so, because of the massive increment to EXP intake, although such is the way of these types of games. Your leveling practically doubles once you get to level 70.

That's an interesting idea, but it's far from the quick-and-easy fixes I'm trying to gather in this thread.