If they ever stop making RBL's, you will see the price go through the roof.
CSMC has already stopped manufacturing RBL's. All the guns coming out now are being assembled from parts on hand. Prices have not gone through the roof, yet.
I own an RBL 20 and a Parker Repro 28, both with straight grip/splinter/DT, 28" bbls. I am waiting for my RBL 28, same configuration but with 30" barrels. The RBL and the Repro are different guns, and both are excellent. It's a matter of esthetics, fit, and versatility. If you need choke tubes in a small bore, buy an RBL. If you need a longer LOP, buy an RBL. If you can't find the Repro you want at the right price, buy an RBL. If you need to shoot steel or other hard non-tox, buy the RBL. If you are only going to have one gun, buy the RBL. If you hope to get out of the gun more money than you put into it, buy the Repro. Hard to go wrong with either one.
The RBL is a more modern design with more versatility than the Repro, but only makes it "better" for some purposes.