A large reason the cost of international leased lines are so
high is due to protectionist tarrifs in international telecom.
I understand it is cheaper to buy a leased line from the
us to Europe than the other way around. (This at least has
been discussed on nanog before).
The point isn't which end it's bought, it's who pays.
Only a few international lines are paid for by US ISPs,
the main exception being the NSF subsidized 1/2 circuits
on ICM/icp.net, and, no doubt, those rolling out European
transit networks (UU net/PSI)