$7.00 Really?!

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I hate when people call and say “bay 3 stole my quarters and would not give me any time, I put in $7.00.”  What?!  You drive to the carwash and bay 3 works fine.  But the underlining point is why would someone put in $7.00 when the machine starts at $1.50 and you get 20 minutes for $4.00?