but if you don't want the philosophy -- if you went on the market today to buy those two Leica lenses you could expect to pay, probably, in the $400 range for either one of them. The red scale is the last of that range in screw mount and considered desirable, and the 2.8 elmar is also desirable since it is faster and was made later in the lifespan of the lens. I have one of each of these -- nice lenses -- so I've kept my eye out on sales and asking prices and so forth.
Dunno about the third. See if one is listed at KEH Camera Brokers. Not being a leica lens, it will be less.
Dealers will pay you 2/3 of those prices because they gotta make a living. Sell them on eBay you walk into the snakepit. Caveat emptor!