Issues I see with this is people stealing other players names and exploiters changing names so people don't know who they are.
1)You can't use other players names... It would be slightly wrong, so everyone would know
2)Their account details would be the same (they would have to keep the same log in details on the forums). So even with a changed name, the ones who can check it out will know they have exploited before.
At the cost of reds too players won't be wanting to change their name too much just to exploit the game. Along with a cool down (which I know I suggested against before) they wouldn't be able to change their names regularly enough to not get caught