Hey CPerkins;
Those who grew up going to the drive in will probably remember they were popular and the price was reasonable for a carload. Some cities may have had up to 7 drive ins.
When we saw GodSpell people actually got out of the car and raised their hands in praise!
While we didn't have much spare money mom and dad considered the drive-in theater cheap entertainment. Still remember gas prices that went back and forth from the upper 20 cents to the low 30 cents.