Actually, I've been on the Victory and Indian websites (both Polaris btw) and they have tons of aftermarket stuff. They even have a build a bike page where you can see most accessories on the bike itself. They have choices for wheels, seats, bags, even bars, etc. You can even save it and send it to the dealer for a quote on the bike as you've built it. Probably don't have to go to the dealer until the bikes ready for delivery.
I think it's an indication of a healthy relationship between a manufacturer and their dealers. It draws bike-buying customers into dealerships to get the add-on's and see the latest bikes. I dunno' just look at H-D dealerships. My Honda dealer has doughnut Saturdays. Not quite the same thing.