Exchanges that matter...

Could you expand on this a bit please? For instance, how do you define

I misspoke. I shouldn't put this in TCP terms, it's just that TCP is
the economic driver right now. But what I mean is "host", whether a
ppp client or a web server or a dns server or whatever. I'd like it
if there were some way to weight endpoints with some kind of "desirability
factor" so that we could more meaningfully charge each other for access
to our nets. Right now it's assumed by most peering contract authors
that all endpoints are of equal economic value to other endpoints, and
all endpoints derive similar subjective value from having access to the
net. None of that is true but we have no way to measure the truth in
this case. Yet. It's more of an anthopology problem than a technology