What was the life expectation of an '50's-eraly '60's color C.R.T.

[leadlike]

Could tv shops sell your old tube as well? Or at least get it rebuilt and charge another customer for it when they replace another crt? I guess they could also say: "well, it will cost X to replace your old picture tube...of course, one of the tvs on our showroom floor could be had for just a few dollars more, which includes that fancy warranty..."