When I cash in tournaments I pick up backups of the molds I already throw. I like to beat in extras so if I lose a worn in disc out of my bag I have another ready. I mostly stock wizards and rocs, those are the discs I throw the most and I don't see them getting replaced. I have 50ish wizards and 25ish rocs.
On a collision course with 1000 courses, the only variable is time.