What would you charge the Rov if he “forgot” to sell your chometz?!
Think about THAT!
Imagine he says, here is your $18 back, I simply couldn’t get the mechira done for you this year.
The achrayus!
While you are busy on erev pessach stuffing the last morsels of chometz in your mouth, the rov is busy selling the chometz with a goy.
What is the legal liability of the rov if he slept in and missed mechiras chometz??? Does he owe more than a refund???