Is this pricing model a thing?

I often find myself “inventing” something and discovering it already exists. But for this pricing model, I don’t know how to search if it’s a thing.

Pricing model:

Incremental pricing, based on the number of users.
For example, the price starts at $10 and increases by $5 for every 10 customers.

For recurring payments:

Same thing, but if someone stops paying, others move on the list.
For example, If I'm the 11th customer, I'm paying $15 per month. When someone who signed up before me leaves, I become 10th on the list and pay $10 from then on.

Is it even possible to do something like this?

I'm thinking a lot about this pricing model. I would love to go into more details, but wanted to check first if it already exists 😇