I thought I would let you know: Our US hoster is regularly contacted by law enforcement about our exits there. Some agents ask if the traffic pattern is balanced, ie. if the same amount of traffic enters and leaves the box.
I always argue that this is a good indicator for Tor traffic, and that it is bad to mix Tor traffic with other traffic for that exact reason.
Due to encryption and compression it might only be balanced to within some typical ratio. I'm sure you have a handle on that number. But that any non 1:1 ratio could make it appear to be serving (or receiving) continual amounts of data. Which in the eye of agents could raise question. Another question is whether these US hosts are just volunteering this data to whoever comes asking, with or without your instruction, or complying with formal legal orders?
On the plus side, hopefully everyone is coming away with the fact that it's just an uninteresting, agnostic, relay service and time is better spent elsewhere.