Have you ever tried setting it to 0 Benway.
I did and got well over 1000 fps. Trouble is the server can't handle it and you start jerking all over the place like you've got bad lag.
On the capping of maxfps at 125 as per Clanbase rules I've got an open mind and think that it should be left to server admins to do what they feel is right.
Personally I allow 333 fps on my server and use it myself. However I still play on servers capped at 125 and just adjust my settings accordingly.
I honestly don't think the 333 thing is any big deal, just slightly better jumps.
toxin OUT means exactly what it says. A players settings must be outside those values.
IN means a players settings must be within those values.
So pb_sv_cvar "com_maxfps" IN 43 150 then the player must have his fps set between 43 and 150, ie it can't be set at 42 or below or 151 and above.
The other way round for out.