Sometimes there are threads about best parking company, especially for adult domains.
In my experience, every domain performs different on each company. Sometimes you pick company that earns most, but with certain advertisers drop, CTR goes bust and so does RPM.
But there's one company where you submit your domain portfolio, set details about your Namedrive, Parked, Sedo/Sedopro, Domain sponsor, Hitfarm, Skenzo, Bigjumbo .... accounts and guess what they do?
They make a test, redirect 95% traffic to best performing parking company for each domain and use remaining 5% to test other companies over time to get actuall best performing parking company for each domain.
They don't shave any of your earnings as they've got special deals with TOP parking companies.
Get more info and maximize your parking revenue:
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http://webmasterinter.net/above.com
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And bump the thread so more people will be h@ppy ;)