You're not crazy. It's common sense. High top sneakers add very little, if anything, in reducing sprains because they would have to limit or range to do that, and they really don't do either. Wore flats, high tops, low cuts, running sneakers - you name it - thousands of hours on the court. Never noticed a difference, except with the running shoes, and I had dozens upon dozens of sprains. The running shoes had too much tread thickness, and after the 2nd or third ankle roll, I ditched them. Other than that, never experienced a difference.
In general, the amount of torque felt in a joint, be it ACL, ankle, shoulder, cannot be reduced substantially with wraps and ties and bands and high tops and sticky things. Someone point out a peer reviewed article if I'm wrong - I'm interested to read it.
Regarding marketing, you've gotta give the Corporations credit. They were very creative at market creation.
When I was a kid, we had basic sneakers, a pair of shorts, and a T-Shirt. Whole ball of wax, about 30 bucks.
Now, these kids buy pantyhose, arm panty hose, shoulder sticky thingies, 100 dollar sneakers, headbands, knee braces . . .
Good marketing boys.