<quote>
and they are used to travel.... how far on average from the launch point???
</quote>
Doesn't matter how far they travel. You can still hit them even if they're over their launch point.
<quote>
each of us ought to be chucking something into the common pot
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Agree....it's called LOOKING OUT. It's not a guarantee but it is the one thing that paramotors, LAA's, microlights, gliders and powered aircraft are ALL equipped to do. If the power jockeys want to carry additional whiz-bang electric boxes that help them from hitting similarly equipped aircraft, or allows them to fly in controlled airspace, then that's fine by me BUT it shouldn't be done at the expense of reducing look out.