The good thing about unlimited wash program is time value of money – you get it up front and with automatic recharge module (ARM) it gets even better.
Bad thing with unlimited is it can affect throughout of in-bay automatic - rate at which the carwash generates money through sales.
The reason is unlike a conveyor an in-bay does not have built-in excess capacity.
For example, assume an in-bay with average time of 5-minutes a wash or 12 cars an hour. Average price is $7.00 and cost of goods is $1.00.
Throughput (T) = (12 * $7) – (12 * $1.00)
T = $72
Now, assume during a busy hour that three of your customers are on unlimited plan.
T = (3 * $0) + (9 * $7) – (12 * $1)
T = $51
Here, the plan price is $30.00 wash all you want during the month.
So, the three plan members would contribute $90 divide by 30 days = $3.00
T = $51 + $3 = $54
$72 - $54 = $22
$22 is opportunity cost of not having all paying customers during the hour and/or not having the capacity to wash more cars an hour.
To avoid this, you would want to have lots of members. Proof,
200 members * $30 = $6,000 divide by 30 days = $200
This shows if you don’t have excess capacity, the ability to convince (sell) people to join has more influence on success of plan than machine.