If the devs intended to continue the incarnate tree I would say stop letting emps/threads be used as a currency (which is weird to me btw).
BUT, if there is no intent in the future to do so then let it stand.
I get it though, there are websites that are selling 2 billion inf + a "free purple" for $85 and a fully set up account starting at $250 and going up from there depending on how much inf, emps, merits, etc are included. Yes, it's bs but, if you restrict anything it's going to hit the player base worse. Because, they will just find a way to still farm and still sell stuff for real world currency. You'd have to restrict the market, farms (of any type), speed runs, etc, etc.
So I get it, and initially I thought why would anyone bother, the game is old, there are different servers now ie; New Dawn, Rebirth, etc so there can't be that much of a demand.
But, the sites exist and apparently the devs are trying to stop something from occurring and that's the only thing I can possibly think of.
So really how do you stop any of it without ostracizing groups of the playerbase.