Hi,
If your domains get traffic i.e. Unique Views but no clicks then try optimising the keyword.
If the domains get no traffic - because of no type-in traffic or pre-existing backlinks, then you'll have to try another route in order to get some revenue, 3 options below in terms of effort required.
1. Easy - sign up to Whypark (costs $100 to allow you host 100 names) or Park4money (free - although I have had issues with these guys) you'll need an Adsense account. Results are variable and depend on the domain, the content (provied by syndicated articles - you choose the topic) and probably the weather - yep you get more clicks when it's raining - LOL.
2. More Time Consuming - develop a minisite etc. see thread elsewhere on this forum 'making a domain earn £1.00 week' - you'll also need an Adsense or other means of moniterising.
3. Full development - only for the comitted and probably only for a few of the better names.
Best Regards
JohnP