i understand where you're coming from, but some creators are already trigger happy in BG as it currently is (without the possibility of recouping any of the spent AD)
and do consider that buying consumables from BG means you will never have to farm annoying mats or pray that some noob will hunt them and sell it to you at a low price so you alone can reap the surplus value;
if this option is made available to BG, it means that you can get an unlimited supply of mats at a constant price you can count on which (unless rectified later on to account for sudden economic shocks) is unaffected by the server's day-to-day economy.
You will never have to go to those different maps to farm your mats, nor will you ever need to go to pront to buy them from those aforementioned noobs