It was with the Heat so my reaction is "blah"
He probably had to sell his Kentucky ring too (they get college rings too, right?). Probably not as valuable in raw materials, but I'm sure there's a much bigger, more loyal Kentucky following than Miami. I wonder what that went for (if there is one).
This kind of thing is interesting though. Being a big basketball fan, I think basketball memorabilia would be pretty cool to own. If I had $20k-$30k extra just lying around, I might consider buying a 2008 Celtics ring instead of a toy like a new boat or car or something. That is as long as it's from one of the starting 5, especially Pierce. Somehow showing off a C's championship ring previously owned by Scott Pollard doesn't sound as glamorous.
If Walker won that with the C's, that would definitely be pretty cool to own though.