The limitation has been bypassed since the main issue people care about (I presume) is how many maps in total you can have/store/farm.
Anyway, maybe I'm missing something, but I don't get the point of forcing people to share their maps. Everyone can collect maps, so why are we encouraging people to be lazy and then leech off others and get their maps? I should also mention that I'm of the opinion that when people run maps together, they should all be allowed to roll need unless the map owner really wants a certain item and thus the others should pass. Also, I'm all for keeping the restriction of selling 1 map per retainer. I have no issue with that.