Fairly short sighted in your thoughts.  A lot of people are going there for the first time and are unaware that there is a charge for the lockers.  And if they are a group of two, who is supposed to remain to watch the bags?  The choice is to skip the ride, or trust that people will not steal your bag.  At Universal Studios, on rides where you cannot take loose items, they provide free lockers.  Not sure why Elitch can't do the same for their patrons.