Well I can't say that I had anything that had a lot of resale value, but a few things I parted with I regret are. An Ibanez LP copy I traded for a NJ series BC ****. The other was an old silverface champ that my dad moded for me with the 6l6 replaced with a tube I can't remember, possibly 5881 and the 12ax7 was replaced by a 7085. Of course I was a lad and probably wouldn't be as excited by it now but I remember the most inspiring tone coming from that little thing.

Old Slingerland drum set from the 40's.  It was painted blue with sparkles thrown on it.  I could have refinished it.  

I had a Harmony strat that had one of the best necks I ever played. Some good pups would have brought the sound of that thing to life. Probably a better body as well. I sold it to a student.
 
The other is a Warmoth. It had a Tele style body and a really fat neck. Swamp ash body, birdseye maple neck and fingerboard. A Floyd rose and 3 EMG pups. That thing had great sustain and probably would have had more it it were a hard tail rather than the Floyd. I paid $400 for it and traded it for a 1979 Les Paul Custom. The LPC had Bill Lawrence pups in it. A dual blades in the bridge position and a single blade in the neck position. I've since put 57 classics it. A 57 Classic plus in the bridge position. The guy I traded with said he wanted my Warmoth because Eddie (Eddie Van Halen) would play it. I mis that guitar..

Sounds like some cool gear Guitarpima. The Ibanez that I loved back then, I got from a guy in the same barracks when I was in the Air Force. The bridge pickup had to be replaced so I installed my first of many Duncan super distortion pups in the bridge position. I also replaced the neck with a Bill Lawrence OBL pup. My favorite combination for that kind of ax. If I were able to get a Bill Lawrence to fit my PRS neck position pub, there would be one in there now. I do love the stock neck pup but not quite as much as a Bill Lawrence.  

My 1986 Marshall JCM800 head.

Right now, the Frontier Tango that I sold would be handy. 

my Roland D10 and Kawai k1R ... sentimental reasons...

As stated in the other thread:
 
1974 Les Paul Deluxe Gold Top.
 

Same as Ol Pal, 

Mine was a Cherry Sunburst Les Paul that I bought from my best friends older brother.
That was when I was 18 (I'm 54 now).  It would be worth a fortune right now, but I'd just like to have
it to play it again.  Or I'd like to have my (Frampton) Black 3 Pick-up Les Paul Custom again.  Either would do..LOL

Yep, my 82 Les Paul, vintage sunburst, would have been my second choice.