well if you figure that sedo is getting paid per click by the advertisers, similar to adwords, i can certainly believe that they're taking up to 80% of the cut... I have never received higher than about $2.40 per click on sedo... while that very same domain.... withe the VERY SAME advertisers made well i guess i can't say lol, but hypothetically it just maybe sorta could have made $15+ a click.
that *could* mean sedo is basically taking a $12 chunk there or 80%.
all i'm saying is that Sedo has a low ceiling for what they pay out to you, but it seems VERY unlikely that there's a similar ceiling for what they accept from advertisers.