Sometimes... Mostly I use dx1000 or sa5000, pro80 with hm5 pads at night when isolation is required. Ha-s400, hd228 or mh438 with my phone when I listen to music in bed. Mh463, hd681, Digitechs, rp-htf600e-s and hi2050 get occasional headtime. I like to refresh my memory on how those sounded and I do a little comparative listening every now and then with those. It's worth noting that all those are cheap headphones except for dx1000 and sa5000. Some not worth more than 15$.
I like budget headphones and I don't really see much point reselling 20 buck headphones (allthough I have done that also). Shipping fees are a deal killer with cheap stuff... So I rather keep them most of the time. When someone is wondering if he should get hd681 or hi2050 it is nice to be able to help. I have no limit on how many headphones I should own but I don't want expensive headphones gathering dust. Besides dx1000 and sa5000 I can see myself getting only one more expensive headphone at some point. I miss some of the more expensive headphones I've sold, especially hd600 and w1000x but those were just too expensive considering the little headtime those got in the end.