1) My Cali76 guitar compressor. It's actually the "wrong" one, designed for guitar and not bass, but I prefer it over the bass version. The bass version had two knobs that basically did the same thing that I didn't want (the low pass and dry/wet mix knobs) and one knob that did what I didn't want it to do with two things that I did want (combined attack/release knob).
The guitar version, OTOH, has separate attack and release adjustments, allowing you to set the mix exactly the way you want. And it has just the one dry/wet mix knob (which I always keep on 0). And it still sounds great with a bass.
2) My GK 1001RB-II head and SBX Plus 4x10 cab. The whole rig is too heavy, and I'm too old, fat and weak to carry it around, but since I don't gig anymore I don't need to ever move it from its spot near the bed. All I need is a practice amp, so why not just use my old gig rig?
The head has been disassembled, with PC boards, screws and cables all over the floor, and put back together again, kept in sheds, rained on, left out in the elements until corrosion caked all the switches etc. And the cones in the cab have been rained on more times than I can count. They still look ok with no scraping or rattles/buzzes, but I wouldn't be surprised if all 4 cones just shot out of the thing the first time I hit the E with the volume knob past 3.
I managed to get it all working again a few months ago, the head still appears to be fully functional and at practice amp volumes, nothing can shred or blow up.
But there's no need to replace it since a) I can't ethically take anyone's hard earned cash by actually selling it, knowing its history and b) it's just as good doing low volume practice amp duty as anything else so, it costs me $0.00 to just use it as is.
L
The other GAS killer for me is re-focusing my attention on practising. I do, however, currently suffer from LMAS (Learning Material Acquisition Syndrome). 
