Harley has 36% market share, Kawasaki has 9%. Sounds like only 4 times as many.
A Harley also recorded the most miles logged in the 2015 Iron Butt Rallye.
Since I already own 2 Harleys in addition to my Concours, it may be a couple of years until the stable expands. Oh, and a Honda too.
Slow is also relative. I know more than a few Harley riders that decidedly ride significantly faster than some C14 owners. No, a HD will not accelerate as quickly as a C14, nor will most go over 150 like a C14. The vast majority of C14 owners don't travel or accelerate as fast as their bikes are capable of so I suppose it's a moot point.
Edit:
And my last HD, a 2006 Electra Glide Classic, was ergonomically bone stock for virtually every on of the 90,000 miles I owned it. 1000 mile days were a non issue.