[tor-relays] Tor bridge on Amazon not doing much

I've been running a Tor bridge on the Amazon EC2 cloud computing platform (per instructions at https://cloud.torproject.org/) since July 27, and while the bridge is up and running according to the logs, there doesn't seem to be much traffic running through it, i.e., latest logs indicate Tor uptime is 2 days 12 hours with 2 circuits open; 6.6 MB sent and 45.75 MB received. Have I somehow managed to misconfigure the bridge or is this normal?

Best, Shawn