Most sports don't have rookie awards as such. Its a product of the way US sports recruit players. And although we have a draft, rookies in BB aren't as capable as rookies in US sports. So really I don't see much of a point in an award for players with skill levels in single figures.
I could maybe, and I stress maybe, be in favour of a young MVP award, perhaps for u21 players. Which would seem to be at least a bit more competitive than a ROY award.
Also, I really don't see having a ROY would in any way make rookies more attractive.