Are you just collecting them, or do you actually buy them with the intention of getting your moneys worth? I just don't get it, but since it's not my money, I guess I don't have to.
Ever consider selling the ones you don't use?
Nope, I'm not a collector, I actually purchase lenses with the intention of using them and I DO use them. Sure, I tend to reach for some lenses more frequently than others but I have used each and every lens. Some are more specialized than others, or some suit a particular purpose more than others. As for selling the lenses I don't use, yes, I have done that. I sold the 18-70mm kit lens that came with my D70 because I don't need that lens and never used it once I had begun acquiring other lenses. I also did sell the D70 and D70s a while back. I had kept the lens thinking it might come in handy but when a friend was buying a new D50 I offered that lens to her. I probably will be selling this same friend my 105mm macro (the non-VR one) since I also have the 105mm VR. When I buy a lens, though, it is not with the idea of saving it as a collector's item or using it and then selling it -- I usually have some specific purpose in mind for the lens prior to purchase. There are indeed collectors, of course, and there are indeed those who buy-and-sell with dizzying speed, but when I buy a lens I intend to keep it a good long time and I intend for it to see some use, not languish in the Pelican case.