Those wireless things don't have much range and keeping up with a spread out fleet of mics and cameras would be nearly impossible. Besides, short of watching someone try to eat a sandwich while on the trapeze there's not a lot of viewer realizable drama happening in distance racing. To someone who doesn't know or care about the very technical details, it's just a bunch of straight line sailing.

The 'general public style' drama happens getting on and off the beach, the quick racing immediately after launching, and the preparations / strategy planning beforehand.