There are solutions around that pays much more than Sedo.
Have you got interesting domain portfolios?
PM me or post here, I might be able to put you in touch with a direct Tier1 access monetizing more than 12 countries including US, CA, EU, Asia.

We have been doing SEM and SEO with direct access to Tier1 networks for quite a long time now.
We have a killer PPC feed access for domain parkers, with avarage monetization 10 times more than SEDO or other standard feeds.
PM me if you have interesting traffic and are not completely satisfied with your actual monetization.
We can offer:
Top Revenue Share(% on final advertisers gross, not syndicator gross...)
Search Engine Optimized Templates
Customizable html title, html description, and page title of templates
Customizable images for templates
Auto-optimizable and manually customizable keywords/urls for advertisements!
and much much more...