I don’t think the other SEs have the computing power to implement anything like Google is/will. (at this time.)
It would be nice if you could buy a domain with some Yahoo listings, and keep them. Would’nt you think so ?
How long is a piece of string?
They are worth looking at. I’ve seen Yahoo listed domains that I wouldn’t pay $10 for. I’ve seen others that I’d pay huge sums for, depending on the overall picture and link structure. The Google happenings probably devalue almost everything in the expired market, but there’s still some value out there. (Like you’re saying.)