Nowadays it is easy to download music. How much can you sell your MDs ? The same price than unwrapped MDs on eBay.
For members like us, the most important is more the brand / design / diversity of the MDs themselves. For example when levanel sold his collection to bobt (many collectors). Last time I found the music collection interesting was when a guy sold on eBay 200 MDs, all in their own sleeve box, with a beautifull sticker and cover (like blueraja) and a wonderfull wooden case ! If there is nothing special, a huge quantity of MDs (>50-100) is also a good argument.