I propose the Player Reports Initiative. If a player(s) submit a report of suspicious activity that ultimately leads to a ban. a small % of that account's gil is sent to the reporting player(s)'s mailbox as a reward.

Filling out reports takes time, some people (like us) who have sent in countless reports are on the backwater list because in order for an account to be investigated there needs to be X number of reports filed by players.

So how to get players to diligently report offenders on a sizable scale? Offer rewards.