It happens in all areas. Some of us play a lot more secluded than others in this regard, but there is usually quite a bit of OOC knowledge behind every good character. Whether it be in a solid ranking group/partner that nearly qualifies as a perma, or a couple tidbits about what and where some nice items are currently, it's no secret that this stuff happens in every little clique and subset of the CF community.
However, unless something is both beyond blatant and unhealthy to the game, the IMM response appears to be: Nepenthe creates some uber godlike character and rapes everyone with amazing play and unparalleled game knowledge.