No. Not worth it.
The way I think about it is in the US the fuel is ultra-pure. If there were problems, we'd see an issue w/ fuel filters being clogged and needing replacement.
Is there carbon build up on the valves? Sure, but if you get some Chevron fuel injector cleaner or SeaFoam, you'll come out way ahead. In addition, when I had a couple of BMW's way-back-when, we were advised to run the engine at a high RPM occasionally to clear the build up.