To be fully honest… Who does really care about having 500 or 5000 or 50000 maps?
Do they take precious space in some sort of inventory? Do you get a popup screen every now and then asking you to spend your maps?
I have like 3k maps and it doesn’t bother me at all, as it doesn’t affect MY gameplay neither in good nor in bad.
BUT, if players with thousands of maps would be able to get 5-10x resources with same time spent as on 1x resources, it could and WILL affect the gameplay negatively for a lot of other guilds, that wants to compete on the same lb or have the bad luck of being in the same gvg.
I believe I don’t have to further explain why it’d break the competition, thus why it will never ever be implemented by the devs.