Two things at work. First of all... yes, Colt revolvers, especially Python and all the snakes have been shooting up to the stars in a ridiculous manner lately, of this I have no doubt, I've watched it happen.
However, beware what you see on Gunbroker. Sure, there are some deals on Gunbroker on some guns and in some cases. But for almost any gun that is in short supply (with increasing demand), Gunbroker will give you an inflated idea of the market and it's simply not THE best or only way to get a feel for the prices.
Gunbroker gets a global audience and everyone has the same chance to say "yeah, I'll pay that!" until the next guy goes ten bucks higher. It's kind of it's own thing, it's not like the real world that preceded it. Prices on Gunbroker for many items are just plain HIGHER than any one of us active on this forum might find in a gun shop or gun show or in the classified area of their local forums.
Example? Go look for a .327 Federal chambered GP-100. Ruger has suspended production of them at the moment. (Ruger does this often, they've done it many, many times in the past) We don't know if they'll ever make it again and there's no way to tell at this point. If you go to Gunbroker looking for one, you'll see high prices compared to what you might expect for a used or NOS GP-100.
Now in a gun shop or show, a .327 Federal revolver is a helluva tough sell. Half the crowd that's there or comes through there doesn't even know what .327 Federal is... let alone has any desire to buy one. Prices would be softer and it'll sit longer before a buyer comes along.