The HPB down the street from me on NW Hwy pays by the inch.
...and then there's places like Know Knew Books in Palo Alto, CA. that paid me top dollar for my Ace Double paperback collection. Unfortunately, the bad far outweigh the good.
As far as the question at hand, if the main concern is leaving cash for the loved ones, it seems to me that eBay or jazz boards are pretty much the only ballgame, at least for the cream. If on the other hand, your goal is to maximize the chance of your beloved music being enjoyed by likeminded people, well, it's still the only ballgame. I don't know if this is practical, but if selling on eBay isn't your thing, maybe some of your fellow board members could help out. (I know it's not practical in my case; I'm stuck with dial-up right now, and no way I'm doing scans of OOP vinyl! )