I find a gat (especially spoolvalve) runs more consistently after the grease has worn in a bit, and if its greased properly an ion that has done 5-10,000 cycles shouldnt be suffering much if anymore wear than a gat that has been freshly greased, because the grease has had a chance to get everywhere it needs to be. I would strip and lube it as oftern as sp suggests.
Its good to always keep your gun in tiptop nick, but this doesnt mean lubing it unneccecarily.
The only reason gats like egos need the rammer lubing after every days play is because its Oil thats used and that a different thing altogether.