True, but we are not in exactly the same situation as some of these other types of businesses. Most unlimited programs I know of are limited to one per day, per car, so it is not truly “unlimited”. Also, restaurants many not have unlimited by the month, but some do have unlimited by the meal in the case of buffets. We also do see more and more “subscription” types of pricing going on. We see it in software, access to digital content and gyms (when they can open again).
We also have a luxury in the car wash business with being able to tie vehicle recognition to rfid, license plates etc. to keep the users honest - for the most part. Not every business could do that. Maybe someday some fast food place will give you one cheeseburger a day for $19 per month - but you will need a chip surgically implanted in your wrist to make sure it is not abused.
As stated above, guaranteeing $35 or $40 per month from say, 700 club
memberships will generally create more revenue than if those 700 people were not members. It is a law of averages scenario that has been worked out to the operator’s favor in cases where there is the proper mix to make it work. Not unlike the work an actuary would do for an insurance company. Maybe that’s what we should call it. Clean car insurance!
I see what you are saying about unlimited brake service - I know you don’t see that, but there actually are plans you can purchase to extend warranties on vehicles and cover significant repairs, which can be paid monthly to maintain.
I guess in short, it is done because it makes more money!