Most people that take notice of my kites, dual or quad have the impression that they're powered by a motor. 'Well then, what's that noise ?'... must be a motor... You know, sail buzz...
If you fly your quad with tails, people notice & approach. No tails, no interest. I've found the less lines, the more interest. The Single Line kites draw the most bystander interest & comments.
I think flying dual & quads requires pretty intense concentration, and people can recognize that, and hesitate to approach to interrupt. And don't forget, to most people now, the most interesting thing in the world is their 'smartphone'. They rarely take the time to look up...
Case & Point : a recent video I made @ 5:27