Well its not to say that they aren't beneficial in certain circumstances. Such as if 36# injectors will only handle 340hp at 47psi, at 55psi they might handle 370hp. Think of it as milking the last bit out of the injectors.
Keep in mind also that its basically air that makes power (sounds ignorant I know but I'm going somewhere here). An engine is an air pump and 99% of modifications deal with air. Cams, Turbos, Superchargers, Porting, Valve Jobs, Strokers, all of that deal with getting more air into the engine. The only time you need to mess with fuel is if you've added more air than they can support.
That said, using an adjustable pressure regulator to add more pressure (thus more fuel) will do nothing for you. Especially after your o2 sensor picks it up and corrects it.
Just a lil FYI so you can spit it at your honda driving buddies