The front end styles/fads change so often that it's hard for UI to become a commodity. The back-end is a bit more stable, for the executives won't complain abou

The front end styles/fads change so often that it's hard for UI to become a commodity. The back-end is a bit more stable, for the executives won't complain about not having the latest UI craze because they can't see the back-end. It may indeed pay better to be in UI, but it usually also means you have to keep your skills up to date on your own dime.