It is kind of on the low end of rich though.

Don't get me wrong. I would love to have that kind of money. I would retire immediately if that was in my bank account.

But we're comparing to people who have 100x that. Or nowadays apparently literal trillionaires.

Like there's rich and then there's rich

Keep in mind that the situation that the OP suggested is a sort of spherical cow. Substantially more people earn <40k per year than earn 450k per year. It is extremely unlikely to earn that kind of money over that kind of timeframe, nevermind being able to save every single cent of it