A little off topic....
I remember in the mid 1980s a fellow member turned up at the Central Lancashire ARC with a sizable box containing about 15 commercial bug keys of various types - the orginal type of non-electronic bug keys with weights on them, Vibroplex etc. How they got into the local household saleroom who knows. He bought the lot for £8 on his first bid! Someone did not want that equipment to gather dust.... Lucky fellow - as a radio ham just being there on the right day.
For myself, I tend to sell on my older radios when I upgrade to something better, I always get that bit more money selling privately than trading in with dealers - providing the radio is working to specification. The only radio gathering dust here in my shack is a Kenwood TM-281E 2m FM radio. As others have said it does electronics no good at all if the gear sits unused without electricity passing through. I also have an almost unused YouKits HB1B as a back up radio, not used for at least a year, but carried on overseas SOTA tours in case my prime mover, a KX2 or my well scratched FT-857D fails on location.
In the past so as to afford a better radio and avoid taking out a loan or drawing too much on my savings I have always needed to sell on the predecessor transceiver.
Here is a list recalling the HF and VHF base radio's, starting in 1981 until 2017 I have had and kept for the approximate period listed before being sold on. In most cases it is an indication of the performance of the radio as to how long I have kept it. Where unreliable I have indicated this in the list. The S designator denotes secondhand purchase and N denotes a new purchase
YAESU FT-101E 2 YEARS S
YAESU FT-107M 5 YEARS N
KENWOOD TS-930S 8 YEARS S
ICOM IC-251E (VHF) 2 YEARS S (UNRELIABLE)
TEN TEC PARAGON 2 YEARS N (UNRELIABLE)
ICOM IC-765 2 YEARS N
YAESU FT-225RD (VHF) 4 YEARS S
KENWOOD TS-570D 2 YEARS S
KENWOOD TS-590S 1 YEARS S
YAESU FT-1000MP MARK 5 (200W) 4 YEARS S
KENWOOD TS2000X 1 YEAR N (USED AS BACKUP HF RADIO AND ON VHF/UHF)
YAESU FT-2000D (200W) 5 YEARS S
YAESU FTDX5000 (200W) 3 YEARS (CURRENTLY IN USE) S
ICOM IC-7400 4 YEARS (CURRENTLY IN USE AS BACKUP ON HF AND ON 2M) S
Owning and operating these radios over the years and updating when the technology moved on, or when I could afford something better, has given me great pleasure. Up until 5 years ago my budget only allowed one main base radio. Now in retirement I can afford to run two, but only because I tend to buy second hand and then I can spend the rest of my money on the most important part of the station the aerials!
Writing this has encouraged me to start a new thread: Chasers - show us your station. SOTA is not just about activating, chasing can be almost as much fun as well.