I shot my Service Grade CMP 1911 for the second time since I got it last year a few weeks ago. I didn't buy it to be a shooter. I shoot it once a year or so. What makes these so special is every one of these was issued to an American GI. Mine was made in 1942. WWII, Korea, Vietnam, and everywhere in between, it's hung on the hip of an American GI. For me, paying a few hundred more for this than some knockoff made in the Philippines or Brazil isn't even a question.
As for the cost, they'll never drop in value, unlike virtually every modern gun you buy the second you sign the 4473 and walk out of the gun shop. I was offered $1500 cash for mine when I picked it up at my FFL. I declined. I would have forgotten what I did with the $450 profit I made by selling it by now.
It's a piece of history. My son will have mine one day.