In theory, as long as the ball bearings and grease are in good condition in the fans, you shouldn't have any problem.
Still, I wouldn't advise higher fan speeds unless the temperature of the computer is too hot. (above 80 degrees C under a full load).
Just FYI, my MBP under a full load only has the fans at 4200 RPM, but keeps the temperature no higher than 65 degrees C.