[stigmata]

I calculated this for the Party 5/10 and 10/20 6-max games a while back. Not sure if it's any help, but I have them at hand, so:

5/10 (6-max) ~ 15bb/100
10/20 (6-max) ~ 9bb/100

There is also the major consideration that a tigher player pays less rake BUT recieves rakeback based on table averages, so in effect they get a significantly discounted rake (effectively paying something like 40% less in rake than the average player in the above games with standard rakeback).