I'd say many more that the OP's estimate. I wouldn't consider myself as any more than a keen amateur, with several other hobbies as well, but I have a dedicated freezer with enough film to keep me going for several years at my present rate of use. This includes a useful amount of discontinued films e.g. Ektachrome, Astia and Efke, all of which I stocked up on at ordinary prices before they finished.
Apart from anything else, having saved up and spent a lot of cash (to me, at least!) on analogue gear over the years, I have no wish to have to spend to re-equip myself with equivalent digital gear!