RMT's are getting worst and this could work (If possible)
Imagine if the Blist is updated to a scan system, that every time a player is blisted, the system scans the chat log and sees if they are offering gil for real money. Once this is detected the character is not just deleted, but the account is banned and the IP is banned.
Once we see the character deleted on the blist we'd know he's been permanently taken care of and we can just delete it from the list, now and then I find a "deleted" icon on my blist, but out of 200, 160 are still there, so I'm unable to delete them.
This would make it unnecessary to make the blist larger or infinite, as long as this system is implemented.
Is this impossible?