Probably more higher than lower, if we all put our money where our mouths are.
$X investment (50/100?) for X albums on the back end. Most everything is already taken care of, and I'm sure D-Sane could do the final mastering himself. If that man decided to go back and add 4-5 bonus cuts, or change some beats, etc., again, everything is already recorded. Just a matter of finding more hours in a day.
Graphics are one of the few things that would cost.......Oh, and "marketing" (industry jargon for, "I'm going to charge you more per unit").
But, dropping 2-3 large on a Best Of album at this point in time? Who would push it? I don't see it happening without a SIZEABLE outside investment ergo promise by the People to help him promote it. Then again, I could be wrong.
Any way you slice it, I've got $100 on it.