Interesting point. Once could buy three of the inexpensive cameras for the sales tax on the more expensive one.
A $150 versus a $5,000 Camera
Yes, if you are a geek with a microscope there are differences, but that’s for geeks who look for these details as a hobby unto itself. For normal people who actually enjoy photos there isn’t any difference for 80% of what you might want to shoot. Many people who read my site buy and own too many cameras. They enjoy dissecting photos for engineering details (as I often do on this site) more than they enjoy making photos. They’re often the same guys who buy too many other toys. Those are the people who keep insisting you buy a more expensive camera, since it justifies their perverted hobby. It doesn’t make any better photos.