I've noticed on almost all markets that the IR versions are usually what people sell and seems to be what people prefer. I have a good hundred or so of them total and want to open a vendor shop asap. But, is it worth selling XR's when everyone wants IR's?
Why not just sell them IRL? Go to a college campus and ask a few people smoking cigs. You'll sell the bottle in no time.
DNMs aren't really the place for Adderall IMO.