45ACP is getting really pricey and I’m having little doubt that I could get a trade-in G17, a slightly used 870, and a near complete AR15 lower for what I’ve got into the Colt. I’m pinchin’ pennies here and I’d really like to hit the range more often.
Then do it. Seriously. It's a tool, and a tool that's not suiting your purposes. If you can get a service-grade pistol, a service-grade shotgun and the better (registered) half of an AR-15 then you're not losing money. Thing about collectibles is that everybody tells you how much it's worth until you ask them ask them to haul out the checkbook.
I've traded off lots of collectible guns, and certainly don't regret all of them.
Got rid of a Colt Delta. Not a Delta Elite, but the limited Lew Horton run of (500?) Colt 1991s chambered in 10mm. That was a damn good gun. Traded it off. Last I remember, my buddy put a 9mm Commander upper on it and gave it to his girlfriend.
Got rid of a Russian SKS and a late `70s vintage Colt Python in absolutely cherry condition. For a bloody Carbon-15. Had a lot of fun with that bullet hose. Was it worth it? To me? Sure, why not? Wouldn't mind having that Russian SKS back, though.
Got rid of an unturned (before I bought it, anyway) S&W 25-5 (.45 Colt) with a 6.5" barrel (IIRC). Think I traded it for a ragged out Colt Viper (before I knew that Vipers were "desirable") because I wanted a lightweight 4" .38 spl.
I guess nowadays it would be considered somewhat collectible... there was the "series nothing" Kimber Custom Royal with a stunning blue finish, and a Kart barrel, Videcki speed trigger, S&A magwell and tuned action that I traded off for a gen-II Glock 22.
Etc, etc etc.
Point is, don't bother looking in the rear view unless you actually care what's back there. You can turn one really good pistol into three good and very useful firearms without losing money.
Do you want to collect or do you want to shoot?