Tell me have I done the right thing?
In my opinion? No.
Here's why...
Motorcycles are narrow. In fact, they are narrower than the person riding them. This means that from head on, someone coming at you is only seeing maybe a 2 foot wide cross section. If they aren't paying a lot of attention (99.999% of drivers don't, it seems), they won't see you.
Let's face it, say your going 55mph (88 or so kmh), and the guy going the opposite direction is doing the same. That means your closing rate is 110mph (176 kmh). At that speed you will, together, cross 1/2 a mile (.8 km) in about 1.26 seconds (providing my math is right). How big do you think a motorcycle without a headlight on looks like at 1/2 a mile? Not very. With the headlight at the very least there is a bright light source that improves your visability.
The problem gets worse, actually, if the guy approaching you is trying to pass. He's just going to nudge over and take a peek to see if there is anything in the lane, if he doesn't see anything he'll come over. The likelyhood of them seeing you with the headlight out is significantly less than with it on, all of a sudden you may have someone in your lane with nowhere for either of you to go.
Having the headlight on all the time helps slightly, since human eyes will register the light source better than the actual narrow cross section. You are simply more likely to be noticed with the light than without.
Plus...
If it's required by law, your likely gonna get a ticket.