That's the way I get rid of anything of no use to me. It's amazing how popular it is around here (London) and so many people are so happy to come and collect.
Last week I offered set of bicycle lights and 6 emails came within the first 2 minutes...
Generally I offer things on a first come, first served basis.
I've never made an approach for something though so don't know how easy it is to get what's on offer.