There is no monopoly in the console market, Nintendo is a pretty healthy competitor that could even outsell Sony when Switch 2 is released and Microsoft is still there although their decisions have considerably hurt their console sales compared to the past.
The baseline price of hardware IS getting higher.
Consoles prices have not stayed the same, previously 199/299$ were the baseline during the PS1/PS2 gen, now the baseline for good console hardware is 499$. There was also the outlier of PS3 that launched at 599$.
You can't avoid higher baseline costs with inflation and when the semiconductor business is fucked with a single company (TSMC) deciding prices, silicon technology being at its limits and more advanced nodes being super expensive.
The Pro IS expensive but at least is a full system at 699$, not just a GPU, the price just reflects the reality that it's an enthusiast system where Sony doesn't feel it's needed to take losses like they do on the base model.
nVidia is just a greedy company that wants to fuck their customers because they can with outrageous margins, they have always been like that, great tech but zero respect for consumers and shady tactics against competitors that could threaten them.
But again some people will be fine with that and their hypocrisy pre-ordering the 5090 but acting outraged about the Pro and few months earlier