There are also cases when GAS is not self-inflicted, but rather comes about because the Digivolk donate their Film gear to us.
I've been given all of these in the last few years: Chrome Photomic F, chrome F2, Nikkor 24, 50 and SB-15 flash, Vivitar 17~28, two black FMs, EM, chrome FG, Pentax K1000, Pentax MX, Minolta Maxxum 7000, Yashica something or other, Chinon CE-3 Memotron, all with various lenses, bellows, motor drives, filters and bags, as well as two large boxes containing about 40 Vivitar manual focus and auto focus lenses in various mounts, plus binocculars and flashes.
I've managed to sell a bit of it, but have in turn given away the Lion's share to various photobuds, a few internet friends and Church groups.
I kept the F2 for parts, and shoot with one of the FMs, but it seems that I'll never completely get rid of this stuff as there is always someone else with Film equipment they don't know what to do with.