We do a lot of reglazes for our customers. Nearly 30% of the jobs we do reuse people's existing or old frames. But many other opticians either refuse to do it or charge so much for doing it that the customer decides to buy a new frame (which is probably what the optician wants them to do).
Our view is different. In this age of recycling we have no problem reusing old or existing frames. As long as the frame is in good condition then we're happy to use it.
This keeps our customers very happy. Rather than throwing away a perfectly good frame, they get to reuse it - and save money on the process. Its a win win.