All of the "skip the line" programs (fastlane/flashpass etc.) work in the manner you described & yes it is a money making scheme....otherwise there'd be no incentive to do from the park's POV.
Coasterfreak:Grizz has been running both trains on all of my visits so far this season & that's on saturdays with minimal lines,I guess people still aren't aware of the ride's existence in that corner of the park because even during the day you can get on with a minimal amount of time spent in line....now if more additions are made nearby in the near future then that may change as all of the coasters in congo were packed to the gills on saturday given their close proximity to one another.
and that the problem with doing a Q bot virtual queue and when the salt! this system is that if 100 people come for the express these increases at the expense of the tail that extends normal excess is not right! I think that Cedar Fair has enough money to provide better service