Out of interest what do you consider "high end"? Over here I'm shooting $4k to $6k weddings. In Australia only about 15-20% of the market spend over $3500 on wedding photography. Does that class as high end in your book?
I think the high end is $8k+. I would imagine that the market in the USA is about the same. 15-20% spend more than 3500.
Funny enough, I do the same thing. Ben Chrisman talked at WPPI about how he has no shame about laying down on the dance floor to get the right angle. He still wears a tie, button up, slacks and nice shoes to weddings. I will get dirty without hesitation for the shot I want. I'm just going to do it in classier clothes. In cargo pants and five fingers, you probably wouldn't even be allowed in many nicer reception venues. I know Houston Country Club requires photographers to wear a tie.