I have been watching the Colt Python, Anaconda, and King Cobra market with some interest, as I have two people with KCs that are interested in selling.
Gunbroker can be helpful and misleading.
There are sellers on there that list for their dream price(not auction) and other potential sellers go on there and see those numbers and automatically think theirs is worth that or that is the actual market for the gun.
Top money is for 98% condition with original box, paperwork.
If you're somewhere down the line from that, prices drop quickly.
That said, the Colt Fanboy Koolaid is very powerful and there will always be a market for The Prancing Pony.
FWIW, a huge number of Colt AR15s were purchased during the last frenzy when everybody was sure Obama was going to take their guns, and those purchasers are not going to get their prices for a long, long time.
Wheelguns are out of production and the market will remain pretty strong.
Colt 1911s produced in the 1990s and early 2000s are loose rattletraps and knowledgeable buyers won't touch them.