I don’t do SLA so I don’t know on specifics. My thoughts would be this though. Does a 50 micron print use more material or consumables than a 200?
If I where looking at FDM then I am probably using pretty much the same amount of material. The things that change are time spent, electricity and maybe more risk of a failed print.
So I am going to look at what is actually different and is it something I need to charge for.
Just some thoughts.