Salvaging that corroded battery compartment has me rethinking repair ethics

I recently fixed a camera where the battery contacts were all green and crusty. On one hand, getting it working again kept it out of the landfill, which feels good. But on the other hand, the special cleaner I needed and the hours spent were pricey, and the customer barely wanted to pay. Is it worth it to push for repairs on items that are cheap to replace? I see both sides, saving stuff vs. practical business sense. What do you all think?