The beer analogy is good. It's a bit like eating as well [i'm becoming very French - everything comes back to food and drink, sooner or later]. One should always get up from the table with the appetite for just a little more. And so with bikes: I've had one or two more powerful than my V11 but I don't miss them, or their power. I've just been out on my Armstrong, with its Dellorto equipped 500 Rotax which might make, oh, 30bhp at the rear wheel on a good day. The air was warm, the roads were slick with recent rain, and I had a thoroughly satisfying, and not slow ride. If it was the only bike I had, I would still enjoy my motorcycling to the max, and still want just that little bit more.....!