You should look up dialectics, it sounds like there would be a lot of new material there for you.
And as for your park example, sure, I’ll explain why it’s not the same thing.
If it costs 10$ to rent a BBQ spot in the park for an hour, do you think that that’s how much it costs to provide that service? It most likely isn’t. Payment is used as a way to limit demand and to ensure commitment for utilization of a limited shared resource. That’s why these resources are usually priced accessibly to the vast majority of the population. The goal is not to make money, the goal is to ensure the shared resource is utilized efficiently.
Do you think that that’s what’s going on here with letting rich people buy access to public infrastructure? It’s not, this is a for profit operation. This service is inaccessible to the vast majority of the population, regardless of whether it’s for sale to the public or not. This is not about sharing a resource, it’s about letting rich people monopolize resources as long as they have the money to pay for it.