I find it interesting. I ride both, K100RS se, love it, and a 2008 FLHT (electra glide for those no-HD).
I think three reasons, 1) Large dealer network, like why Les Schwab sells more tires in the west, cause he has more dealerships.
2)HOG (Harley Owners Group), they promote the brand, sponsored by the dealership, promote riding and brand name, bring riders together for regional/State rallies and monthly meetings
3) Made in America
I have friends who ride both. I think they are both good bikes, and really come on riding is the key. I enjoy longer rides on my Electra Glide, my preference, nothing against my Motobrick, but I fit the riding position better on all day, all week, all month rides.
But I gotta tell you I dearly love riding my Motobrick on poker runs by the local "B" MC club, it really makes them look at me.
Ride on and be safe!