I rarely sell things for a couple of reasons, but mostly it is not worth the work for the money I will make.
What I do sell, I do on the local Moms listserve where they will come and pick it up. More often I give it away, since that is what this group does and I have gotten my share of things that way.
The other big considerations is taxes. If you donate to a registered charity you get the tax wright off of the item's value, with almost no work, and lots of warm fuzzies. Also lots of them pick up.
Mama to J (Jan '09), E (May '11), and C (August, '13)
Professional Cloth Diaper at Diaper Lab in Boston (ask me about laundry)