Unless the revolver has been severely abused, Bubba'd, or neglected, most things are simply the result of wear, or perhaps less than loving care. As such, a competent revolver smith can make most anything right. Rather than miss out on shooting some truly great pieces, go for it. Unless you are collecting, and want all original, and/or excellent condition, in which case, well, either buy only from most reputable dealers or after close personal inspection - for which the OP sounds eminently un-qualified - plan to pay oodles of dollars, and expect to not always get what you pay for!
Revolvers, like semi-autos, like engines and knives, wear out. Unlike knives, they can normally be re-built as good as, or better than new. See M.D. Charlton for last.