The only reason that you would need to de-copper a pistol is if you ran competitions with it every weekend, and trained during the week.
Even then, if you did it once every 6 months you'd be better off than most.
I remember an article from the mid 90's that I read about some "new" sig that had come out. The author and friends had something like 10 magazines for the pistol, and spent a couple weeks placing 50,000 rounds downrange. (this is back when a $160 would buy a 1,000 rounds of Winchester White Box 9mm Ammo)
(We can talk about the DE-valuation of the American dollar later.)
Anyways, they fired groups with the Ammo before hand right out of the box, again after shooting, then again after a really through cleaning.
After the "torture test" they cleaned the pistol very well, including making sure the copper fouling was taken care of.
At 25 yards, the pistol did group slightly better after the cleaning.
That being said, 10,000 rounds is WAY more than most pistols will ever see.
Even Police trade ins with their Holster Worn exterior and pristine barrels and firing mechanisms, Haven't gotten to 10,000 rounds.
My recommendation would be to take a look, if it is a used pistol clean it once really well, then just stick to your CLP. It is good stuff, and about the only thing I do with my pistols.
New pistols it really isn't needed unless you do some high volume shooting, or you want a really clean pistol before you put it away.
The only other thing I do is wipe them down really well with CLP-Collector if I'm not going to shoot them for awhile.