It's rare because they didn't make too many - about 500 IIRC. It's valuable because it's rare, and it's one of the highest-end receivers Hallicrafters made. It also looks "right" - as a serious receiver should.
I have one, and while a nice receiver, it's not worth $3K as a receiver IMHO. This opinion was shared by many who took mine for a test spin at the AM 'fester station at Howard County hamfest a couple of years ago.
I'll probably bring this receiver to Gaithersburg this year if you wanna try it out.
73 John
Johnnie,
I really enjoyed taking your SX-88 out for a "roadtest" at Howard County, and hope to play with it again at Gaithersburg, later this year.
It's a substantial, handsome, "manly" receiver that has "sparkling" audio, as a mutual acquaitance would say!