I didn't really intend to go into a discussion of selling, but I think the only way to sell effectively is to do a significant volume, absorb the bad into the good and be willing to let the law of averages work on your side.
Buyers prefer to save on postage through multiple orders, so you have to give them that opportunity.
I've been extremely happy with both my Discogs and Ebay selling. I prefer Discogs especially when I'm not entirely confident I want to get rid of something. I can list it and let it sit at a high price and wait for an offer. No harm done because there is no listing fee, only a sale fee.
On Ebay, you have to put a lot of work into a very large listing to get good results. Listings have to be tight and professional or buyers will stay way. I've watched the growth and ridiculous success of a friend of mine in New York who was new to selling reggae online as of 4 years ago and now he does more volume than almost anyone.
Baba Jonah, that's great that you've contributed 130 listings to Discogs - exactly what I'm hoping people will do and what I intend to do. I think I've contributed less than 50 so far, but have hundreds set aside. I have hardly scratched the surface on my 7-inch collection. It will take some time but I'm looking forward to it.
As long as I have my data entered and downloaded before iTunes buys Discogs, I'll avoid the problem Jah Bill is predicting, oh my sour old friend