if people's accounts get compromised then its their fault and the ban is warranted imo. they were either

A. giving out their info to people which is a violation of the TOS and ban worthy

OR

B. browsing websites with keyloggers, which are most typically the sites that sell bots and gil, and while just looking in itself isnt a bannable offense, people should take more care with their internet browsing and security, so i have no sympathy if they get an unwarranted ban, if it was really an accident they should be able to get the account back

OR

C. they actually purchased something through RMT and were stupid enough to give the account info to the RMT'ers, BAN HAMMER WARRANTED

case and point, dont be stupid and your account wont get compromised, i fully support the OP's suggestion, my blacklist is still full of gil sellers that i put on there in the first week of early access. and honestly, whether they are RMT or not, there should be a punishment for getting blacklisted too many times. if you are a legit player and on more than one person's blist you are most like a toxic member of the community that is better off banned