Hard to believe, I know. Well, here are a couple of other ads from the same guy and a 3rd one from gunbroker.comI couldn't image those matching Colts being worth even close to that amount. I believe it was a misprint and I would say $3000 was the intended price.
There are folks with big $$ that are willing to pay those prices if the guns have something unique about them. Being a matched pair the BOAs in the original post are rare being that only 200 matched pairs were made.
I had a S&W Model 19 Combat Masterpiece PPC gun and my Model 686 L frame both worked and built by a very well respected S&W armorer. Straight out of the box both of these guns are just OK. Once they have been worked and or built by a custom gunsmith they come to life. Keep in mind that none of the stock Colt or S&W wheel guns come from the factory ready for any type of serious competition shooting. The BOA guns were given some very special attention much the same as my S&W guns got. Not sure if S&W ever did any special action work such as the BOA guns from Colt but while involved in the PPC competition shooting there were a few S&W armorers that could make a Smith run right up against any of the Colts. Neither gun shoots any better or straighter than the other until they get some action work and cylinder timing work done. We did a lot of playing on the range with both guns in a Ranson Rest trying to determine accuracy from the various brands and never did find one that surpassed the other as long as all things in the guns were well adjusted. The question we were faced with every time back then was do you buy a S&W for around $300 or pay twice as much for the equal Colt gun when considering the stock guns sold at most shops. A BOA Colt Python would probably cost upwards of $1500 while a S&W L frame was around $325 and in the hands of a good smith could be made to be as smooth and accurate for a couple hundred extra at that time.That's about the going price for a Boa. I know the the original 1873 SAA go for more than that if they're in good condition.
The BOA was essentially a limited 'custom' gun from Colt. Compared to my Performance Center N frame S&W the colt custom guns I've tried operated much better with no or little work necessary. My S&W PC gun needed a lot of work to get it competitive and was not even close to being as smooth and accurate as the Colt 'custom' guns right from the factory. Don't get me wrong, I really like my S&W now that it's been reworked but it took time and $ to get it up to the level of a competitive gun. Now that the BOAs are no longer made they have gotten into the status of the 'legendary' gun like the original SAA.
You mention Rossi. A lot of folks put them down but I've been shooting a model 92 Rossi in cowboy action for the last 7 years and it works great! Did do some polishing and lighter springs but it was very smooth out of the box. Won several matches with it and can consistently finish in the top 5. When I let folks try it they're amazed at how smooth and accurate it is.It is not the sword, it is the swordsman. Smith or Colt or Ruger or Rossi or J.C. Higgins or High Standard or whatever doesn't matter if the shooter is truly competent.
The best trigger job on a stock out of the box Smith and Wesson revolver is to shoot it a few thousand times and dry fire it (not the rimfire) a few thousand more times. All the parts wear together and the action becomes silky smooth. Of course this means one has to take it apart and clean and oil the parts on a regular basis but it is worth the effort.