Calculating real odd for BBJ on GG

Hi,

is it possible to calculate real odds to hit BBJ on GG?

According to GG´s fee it should around be 1x first place, 1x second place and 4x share in 800k hands, but after discussion with many regs, it looks like we pay much more fee than we get from BBJ.

So i am curious if it is possible to calculate real odds to hit BBJ (if everyone plays GTO ranges)