Also, please believe that 20 vomiting "free drinkers" have made the wisest decisions known to humankind, throughout our history.
20 drinkers x 2.5 drinks each x $5 equals $250.
Roughly .02% of yearly dues collected by an organization who desperately needs every dime to save free flight on this planet, the universe, and, indeed, our entire galactic sector, 32% of these alien beings actually fly aircraft capable of safely negotiating normal atmospheric turbulence.
Ahhhh, math.... on a napkin!