after buying out all of a specific catergory, you get a ""achievement block"" that would essentially make to things easier to use.
like, for example, after getting every paint, you automatically get a paint brush that you can switch the color of in your hand.
or a wood gun, that would work like Scrap Mechanics build system. (if you know, ur a real one)
this would help combat the completely reasonless overpricing in decorative items.
(even if you don't like saving, voidx_., there's still no reason for clams to be a higher price than gnomes, or a pillar made of wood to be higher priced than a pillar made of ice.)