Not 100 percent sure if this will happen but

There are two matters that give botters an advantage. Attacking a full map to obtain items easier, and usually godmode.

With this system, it would not give them any advantage over others besides time. Sure, a botter may be able to collect all twenty nebulites in an hour where it may take a normal player an hour and a half to two, but they are still only able to produce two nebulites per character. A normal player can just switch characters and continue on getting nebulites.

If that wasn't in place, then it would be much, much worse. Would you rather a botting character to produce two nebulites or a couple hundred.

You're giving some botters over 2x50 boxes a day though. They have multiple bots running at once.

Nebulites should of course be made available, just maybe not through monster drops.