Enthusiast in this contest more or less means you are excited enough about something to get a level above what normal people should get and just below professional pricing. An enthusiast camera body can be 2000 euros.

I would say an enthusiast computer is 2-4k.

It really depends what you meant with minimum salary (yearly?) because paying 3 months of salary for a computer like that isn't far fetched. You're not using this to generate recipes for cookies. An enthusiast level car is expensive as well.

Why? Enthusiasts are by definition people for whom value for money is not the main driver but top performance and cutting edge novelty at any cost. Affording enthusiast computer hardware is not a human right same how affording a Lamborghini or McMansion isn't.

But you don't need to buy a Lamborghini to do your grocery shopping or drive your kids to school, same how you don't need an Nvidia 5090 or MacBook Pro Max to do your taxes or do your school work.

So the definition is fine as it is. It's hardware for people with very deep pockets, often called whales.