Bill Gates doesn’t care about a $200 double parking ticket, in fact it’s probably worth it for him if if saves him time. He has no incentive to abide by that rule. If you scale it with income then everyone actually has skin in the game.

He also could easily avoid the direct fine by having a driver drop him off and idle outside, or just not directly own the vehicle in question.

The point of raising the price accessing any shared asset is to optimize usage of that asset. Otherwise you end up with private enterprises like non-street parking lots eating the profits with nothing going to the rest of the people.

You're not optimizing the usage though, you're just making it so that people who cannot afford won't be able to park. Sure, if you raise the price enough more spots will be open. What purpose could that possibly serve..?

If you don't want non-street parking lots to funnel in all the profit, then you provide efficient and wide-spread public transport.