“Should I buy out my lease?” super-thread

I have a 2021 M340i that was delivered in April of 2021. Based on what I’ve read on these forums I got a “steal” back then. I’m currently paying 641/mo on a 12K lease. My original deal:

I was at the local dealer in Tenafly yesterday and they quoted me roughly 1K for a 2024 M340i with loyalty and 1K lease incentive. I rejected it immediately and then thought about just out and out buying my car off lease. I’ve got 20K miles and the resid is 37,800. Worst case I put minimal amounts down and finance it over three years and get a payment that’s roughly 1K. But what worries me is the warranty. The sales person quoted me about 3K for an extended warranty but that seems high. Dealer also said there is no equity in the car - i find that hard to believe because it has low mileage.

The car has been great - no issues whatsoever. I’ve kept up maintenance and it’s in great shape. Are people who got these “deals” from three years ago buying these cars out of their leases? Seems like it would be the wise thing to do.

Thoughts? Am I missing something? Aside from those who just want a new car every three years? That is generally me but I just can’t wrap my brain around a lease payment of 1K for any car let alone a M340i.