Baca,
Hell yeah, I know of VERY few cocker users that have actually taken their time to set up all their regs correctly. They'll take their grip frame apart but never bother to set their regs up.
However, I don't buy the whole things about starting at certain "reccomended" pressures. I think you should always set a gun up with the chrono as that tells you the correct pressure with all the gun's individual things like spring tension/hammer weight/valve flow etc etc.. Fine use a gauge after to go back to the right point quickly but not aim for a pressure in the first place.