I’ve had the $500 Shaitels and the $3500 Shaitels and I can tell you there is a big difference, IMHO.
The 3500 one is matched to your specifications, color, cap size, etc. The 500 one (in my experience) had little elastic bands to tighten the fit (not as well made), was machine made (had rows of fabric with hair tied on vs. Solid net cap. The difference there is major. I once sat on a bus behind a woman with a Shaitel with fabric “rows”. When the hair moved even slightly, I could see the fabric lines. I wanted to tell her but realized she’d just be ashamed. Don’t assume it’s invisible. It’s not. Especially when the wind blows. My expensive customs were so well made that on occasion my husband thought I had yet to put on my Shaitel when it was already on! There can also be additional issues withquality that go unseen initially, such as clumping and knotting of hair at the nape of the neck. All Shaitels need to be brushed out bait, but I’ve heard some real horror stories from people about this.