I don't think you would need to be anywhere near FM strength to get on the first page here (although I like hedonist's point).
Remember, this site is essentially a pairings free-for-all, and a person's record (and to a certain degree, rating) is almost meaningless without conducting a very deep and thorough study of who they played, when they played them, and how often they played.
Unlike an OTB tournament situation, we get to pick our opponents, choose how often we play them, and avoid anyone we want. Clan, league, ladder, and tournament play mitigate this somewhat, but they are all voluntary, and they can also be avoided easily.
The rating system is so easily manipulated, that it amazes me that anyone takes it all that seriously.
Even more so, the motivations for playing on the site also vary considerably more than they do OTB. People play to win (in the pure sense) far more in OTB play, and they usually play the opening they think will give them the best chance in the tournament to be successful.
On the site, there are plenty of people (of which I am one) who don't always make winning the absolute number 1 priority. I certainly do in clan and tourmanent games, but in casual games on the site where the outcome only matters to me or my opponent, I have experimented with all sorts of different openings to broaden my palette and deepen my exposure to new ideas.
Some of those games have been less than successful for me, to say the least. I have also been the beneficiary of such games, including one player on the first page who told me in advance what the best move was in our game, but then played an inferior move as an experiment and lost. He crushed me in the other game, of course!
I'll also more readily sac or play speculatively- if I lose, I just start another game.
Re-entry opportunities in tournaments are fewer, and cost money!
The bottom line is that we can tell very little by looking at a list, and those who read into it with only speculation of malfeasance are here merely for the entertainment of gossip.
It makes for some fun forum reading, for sure, but there are only a handful of players on the site with the evidence and ammo to press charges, and the rest are just the internet version of the loud guy at the pub who should have stopped before the last pint.