In more detail here's a broad calculation for a home darkroom using 2000 sheets of 8x10 gelatin-silver photographic paper per year:
Silver content of photographic paper is notionally 1 milligram per square inch so 2000 sheets or 160,000 square inches of paper carry 160 grammes of silver.
160 grammes is about 6 ounces. If half the silver stays in the paper to make the pictures the other half goes out in the fixer. That's about 3 ounces.
World silver prices vary but at $20 an ounce the discarded silver is potentially worth $60.
Allowing for the expenses in recovering the silver, shipping the concentrate, and refining it back to metal, the home darkroom operator could potentially score every year a $30 ingot about the size of a large coin. Turning this ingot into cash could fund the purchase of maybe 30 sheets of 8x10 photographic paper.
Worth it? YMMV.