My reasons seem to be many.
Loyalty to MOCO is not one of them.
I like the rhythm of the engine, potato potato
I love that you can take a stock bike and make it yours with many vender's to chose from, no other brand has that ability.
I like the way you can wear what you want (clothing) and it does not matter on a Harley. Other brands seem to dictate other choices. (I know you can wear what ever you want, but it seems more restrictive on certain bikes)
Harley group has it's own language, Ultra, Road king, Road Glide, primary, jugs, twin cam etc.
I must admit that from the neophyte, Harley is held to high degree of awe (even if I do not agree)
I have many conversations with total strangers just because I ride a Harley.
These are some of the reasons I settle for a technological dinosaur.