Have noticed a few classified ads lately where I've thought; hang on, that guy bought one of them before! (no names, you know who you are

).
Made me wonder how often we buy something, sell it after a while but then buy the same thing again at a later date.
I recently bought a William Optics ZenithStar 66, but I had owned one of them about 7 years ago. No idea why I sold it!
There have been a number of eyepieces I've sold and then tried to buy again (24mm Panoptic, 36mm Hyperion) and the only reason I didn't is that I bought something similar but different (22mm Panoptic, 40mm Paragon).
Anyone else go through cycles of buying & selling the same gear???