Is a Gold Cup worth it over a standard Colt - in a word, Yes. It is a "production" Colt - not a Custom Shop Gun - but the current feature set, if added after the fact to a standard Colt (or Springfield, etc.) would cost you more. Just fitting BoMar style sights is going to be $2-300.00, then add the beavertail (most will opt for the GCT for casual shooting, unless they are real traditionalists) and the wide trigger is not found anywhere else.
Bullseye shooters are a tiny but very specialized lot, and I doubt any of them run a dead stock ANYTHING regardless of maker - and their guns are sporting goods - tennis rackets, not weapons - pretty much Range Only items. Make no mistake, these guys are highly disciplined, very respectable athletes and they do have my respect for their craft, but their game is "accuracy at all costs" and has nothing to do with a weapon you would actually carry into harms way. So unless you are a Bullseye competitor, I would ignore their concerns in your selection. If you ARE a Bullseye competitor, you already know what you need and that it will certainly cost you ($$$) a LOT more than a new Gold Cup. Colts are made of good steel and make good base guns for any purpose, but their are many choices today.
Another factor where Colts have the edge is "feel" - the gripstrap is not the same dimension on all makes - Colts generally feel slimmer and better in the hand. Springfields have always been "blocky" by comparison.
1911 practical accuracy is almost entirely in the barrel/bushing/slide/slide stop lockup - frame to slide tightness only matters for the entirely artificial mechanical (Ransom) rest testing - your hand shoots the gun in real life, and you line up the sights. The
Ransom rest can't do this - the frame is locked - and ANY slide frame play will make for a bogus test of the gun's real ability. Tight slides are wrong for a defense gun.
So, in closing - the Colt Gold Cup has a NM barrel, a wide trigger and excellent adjustable sights - and a beavertail, checkering on the newer models, etc. The Colt frame "feels" better in the hand, and resale will generally be higher for a Colt in good condition, and "Gold Cup" is a well known model, which also helps. Yea, it's worth it! CC