I already explained how the market would work itself out (see below):
First of all, Pgems bulk trades already happen. People may start picking up gems and low runes more often since it takes up less space, but that’s not necessarily a bad thing. The market automatically works itself out. If a poor player is raising funds and wants to sell mass gems to a rich buyer but now those pgems are worth less, the rich buyer now has more funds to spend on other things like mass crafting jewels which the poor player can pick up as well. So what the rich buyer spends less currency on, it will be made up in some other area. That’s how the free market works.
it won’t affect HR prices. You need to pick up 14,281,868,906,496 El runes and cube them to make 1 Zod rune. People pick up EVERY high rune anyway regardless of stacking or not.