I dont have any plans to use my hand history for any reason but i was told by a cat that plays on full tilt that after he started saving his hand histories the program stopped cheating him as brazenly as it did before.
---->A possible reason for this is that Full tilt will recognize whos recording there hand histories and wants them to look as ligit as possible in case they get posted anywhere. Because the majority of players dont bother with hand histories it doesnt effect company profits all that much.

Its an interesting idea, i currently dont know how to save hand histories on full tilt, can someone tell me how.?

Maybe you should ask your cat.