Sorry, but that's delusional.

For starters, hardware doesn't innovate quickly enough to buy a new generation every year. There was a 2-year gap between Ryzen 7000 and Ryzen 9000, for example, and a 3-year gap between Ryzen 5000 and Ryzen 7000. On top of that, most of the parts can be reused, so you're at best dropping in a new CPU and some new RAM sticks.

Second, the performance improvement just isn't there. Sure, there's a 10% performance increase in benchmarks, but that does not translate to a 10% productivity improvement for software development. Even a 1% increase is unlikely, as very few tasks are compute-bound for any significant amount of time.

You can only get to $15k by doing something stupid like buying a Threadripper, or putting an RTX 4090 into it. There are genuine use-cases for that kind of hardware - but it isn't in software development. It's like buying a Ferrari to do groceries: at a certain point you've got to admit that you're just doing it to show off your wealth.

You do you, but in all honesty you'd probably get a better result spending that money on a butler to bring your coffee to your desk instead of wasting time by walking to the coffee machine.