Oh, because traffic analysis
is hard, and most exit node
operators are amateur hobbyists.
or maybe That's just the way it works.
You can't make TOR work any
other way.
That's basically what I hear. It's the HAM radio excuse put another way. HAM radio has utility, bause we think it's neat. You don't need to worry, because it's free for everyone to use.
Just because you have trouble imagining the implementation of such a thing doesn't mean I do, and doesn't make it impossible.