Exclusivity is good in a game, in my opinion. What if you spent all that gil on maps, then they listened to you and raised the drop rate to 1 out of 3 Piesteskin Maps contain a minion? Not only would every person in the world have one, but they wouldn't sell for more than 5k-10k on the MB.

I understand some people are collectors, and also I'm overexaggerating what the outcome could be (or am I?), but when you're one of only a few in the world with a specific item, doesn't that mean something? If not, why not cherish your Mammet minion bought back in Gridania at level 1?