It's worth noting that the Internet Archive are always on the lookout for more records to digitize, so if you (or someone you know) has a collection and wants to see them go to a good home where they'll be preserved, you can donate them [1] to the Internet Archive (they also take 33/45rpm records, books, CDs, etc...).
I don't know why I didn't think to check into this sooner, but I inherited my grandfather's record collection that is >5,000 records, and I just couldn't bear donating it to some random thrift store, and I knew that selling them would just mean someone picking through the collection and leaving the dregs. This is a solution that I've been looking for. I do listen to some of the records, and I enjoy it, but I don't have time to digitize the whole collection, but this is actually a better solution, because now other people will be able to enjoy my grandfather's collection besides my family.
(I'm not affiliated with the Internet Archive)
[1] https://help.archive.org/hc/en-us/articles/360017876312-How-...