Ok I purchased from this seller twice, INCREDIBLY fast and professional service .
The only problem seems to be that Gumi will notice it with 24 hours. That sucks... But there is a silver lining.
After purchasing the largest amount I could from OP I used every single gem, and maxed out every characters limit break too, before being banned. File an appeal stating you will never do it again . I simply asked to keep the characters and be stripped of all Gems. They replied with returning the account to me minus all my Zeni,Gems(paid or free doesn't matter you will lose them all) Tokens, and Items... But I have every character now, fully limit broken at the start of the game.