Man, you're asking all the hard questions!
Not because of pressure. I'm sure I bought it for my own motives, and will eventually trade up for my own motives. Actually I was about to buy a larger Boulevard from the dealer, and watched a young guy sit on it, and say he'd take it. So the 650 was the fall back.
I'm doing quite a bit of highway riding, and expect that to continue. I think a larger bike will be better for that. I'm practicing u-turns in the road, and other low speed maneuvers every time I ride, and I expect that will equip me for a bigger and heavier bike.
Otherwise, I have no idea why! But thanks for making me think about it.