I know plenty of people who don't make a lot of money (say top 25% or so) that will have a Boat or RV that costs more than a $3500 computer, and balk at the thought of spending that much on a computer. It just depends on where your interests are.
There are tens of millions of top 10% income adults in America. So something can be both unaffordable to most people, and also easily accessible to very many people.
There are a lot of people who could easily choose to spend $3,500 on a computer.
Some people succumb to lifestyle creep or choose it deliberately. Others choose to live below their means when their income grows. The latter have a lot more money to spend on extras, or to save if that's what they prefer.