I assume you really mean ad as in advertisement when you write "Here is a Ebay add for a Colnago Master". I dislike misspelling words. Probably comes from winning a few spelling bees when I was in school as a kid. And for some reason you did not post the ebay link for the Colnago you are complaining about.
As for the Columbus tubing Cinelli bike you did post a link for, $499 plus $80 shipping is higher than I am willing to pay. Figure several hundred dollars for someone like Andy to repaint it so it has a new paint job and decals. You are into the frame for close to a grand. I assume it would be a fine steel frame and fork. But its probably 120 or 126 rear spacing so would need frame fixing for more dollars by Andy to use new, modern components. Unless you wanted to buy and use 1970s and before components. Which some people do. But for fun recreational bicycling, I prefer more current bike technology.