There is no way that, with the wording of the current FAQ, the mods would be justified in banning anyone for meta-gaming, even if it is proved and they admit it. To remind you all, the FAQ reads as follows:
"Meta-gaming is usually frowned on, but is acceptable in some cases and not seen as being as bad as multi-accounting."
So it is made very clear in the FAQ that metagaming is NOT against the rules of this site. While it is poor form, or essentially bad manners in some cases, if it does not break the rules, it cannot be a banning offence.
If the guys in charge of the site decide to change the rules and the FAQ, and make this change VERY clear to existing and new players, then after a few weeks of letting people get used to the new rules, it might be legitimate to ban metagamers, but not until then.