Here's an interesting tidbit from my experience. My son was looking at purchasing a Udemy course. He was asking my advice about it as we chatted over the phone (he lives a short distance from me). I visited the site and found the course he was referring to. "Oh, the one for only $11.95?"

"No, it's $19.95"

After going back and forth for a moment we verified it was the same course, but for him it was offered at a higher price. He was using an Android phone to visit the site, and I was on a Linux box. He had never visited the site before searching for this course, and I had never heard of it.

The difference? Not exactly sure? Is it profiling based on OS? Doesn't seem likely. I suspect the price was based on cookie residue he picked up or profiling based on prior surfing. He had been searching the web for a while looking at similar products. Was his surfing behavior calculated into his price, scoring a more likely chance for him to purchase at a higher rate?

I have not yet found out (does anyone here have a reasonable explanation?), but it's a definite turn off to use any more of their products.