I am curious if there is a need for this; I personally have 20 or so domains I have purchased for random things over the years, but I probably will never use them. Selling them is a pain generally, and I know none of them are worth too much. Would there be demand for a site:
1. setup a landing page listing your domains
2. verify all the domains with a text record
3. point all your domains to the landing page
4. someone can purchase the domain
Would you pay 7.99/mo for this service? Would you pay nothing, and allow adwords?