I've had that same thought, but it'd be quite a lot of work to update multiple builds every week. Also, higher or lower budget builds are much harder "standardize". With a budget of $1000, it's fairly easy to design a build that's good at everything, a jack of all trades sort of build.
With any build well below $1000, you have to make compromises here and there, and maybe even some sacrifices like not including an SSD at all. But there's no one correct way to decide what compromises and sacrifices to make, thus there's be need to have budget builds for various different user needs.
With a budget significantly above $1000, you have the opportunity to improve various aspects of the $1000 all-rounder build. You can choose to make it better in some aspects while leaving other aspects at the mid-range level. And as before, there's no one correct way to decide what to improve and what not to improve, it depends on the particular user's needs and wants.
This is why the $1000 midrange build works so well as a template that people can then adjust to their own needs and budgets. An $800 build with lesser gaming requirements? Get a non OC motherboard and CPU, drop the GPU down one notch, and get a 100W lesser PSU. Ta-da. A $1500 build with SLI compatibility? i5->i7, double SSD size, make sure PSU and motherboard are SLI compatible, up the GPU by one tier. Done.