While I understand the frustration, getting mad at a free market system is a bit of a "shooting pool with a rope" scenario. The demand is there, so the prices will follow.
As for the pricing on an aftermarket bolt, if you were in the business of building rifles that sell at a certain price point, and those rifles were being bought up pretty much as fast as you could make them, why would you divert any of your manufacturing or assembly into just making the bolt assembly? And if you do, you want to get the same margin from it as you would from a whole rifle because for every bolt sold without a rifle, that is a rifle not sold.
For stocks and other 3rd party items, right now, most aftermarket providers are tooled up to provide Rem 700 support. Changing that over to Tikka support requires new tooling, programing, etc. That stuff isn't free, and they aren't going to wait 10 years to see the return on the investment. If Tikkas remain as popular as they are now, I can see product pricing start to stabilize as more competition enters the market and the existing people have recouped their investment dollars.
Finally, I will remind everyone that the Consumer Price Index has gone up by 16.5% under Uncle Joe. That means that, on average, you are paying 16.5% more for something today than you were in 2020.