InsaneJournal Announcements

I wouldn't be surprised if this question has been answered before, but I thought I'd give it a go! I mostly use this site as a place to RP, as do many of my friends. A large number of people have expressed interest in incremental extra userpics (say 50 extra for $10 or something to that effect), but aren't interested in paying for all the added features of a paid account on all their RP journals. Would that be a possibility, or a pointless strain on the server that would end up costing you more in the long run?

Thanks in advance!