Premium brand brushes do not work any better than a sturdy but cheap Chinese badger. You are not paying for a more effective brush. You are paying for craftsmanship and more expensive handle materials and whatnot. Pride of ownership. Appearance. Those qualities are worth the price for some of us. Some of us are satisfied with a molded plastic handled black badger for $10. In this matter truly YMMV. My favorite brush is a massive 30mm Frank Shaving silver tip that cost me I think $34. That's about the most I will pay for a brush but I can see how one might think that some of the "better" brushes might be worth a couple days wages. Like I said YMMV.
"A noble heart embiggens the smallest man." (Jebediah Springfield)