Your local picture framer is literally drowning in off-cuts. They simply don’t have the space to store off-cuts and unused lengths of moulding.
Wooden mouldings don’t age well, they bleach in light and are not suitable for commercial framing after a few years.
Framers won’t arm wrestle you over the price of an old moulding. To them, it is recouping lost profit and liberating space in their workshops.
If you are looking for a cheap frame don’t hesitate to ask your picture framer if they have any old mouldings laying around (They do!). The great thing about past-their-sell-by-date wooden mouldings is that with one coat of liming wax they can be transformed into expensive-looking shabby chic off-white frames.