Citation, please? Where are you getting the idea that exit nodes have huge bandwidth bills?
For example: run a mac mini colo as an exit node, with unmetered bandwidth. $55/month, with 100 Mb of bandwidth, 24x7.
Or some guy in Korea with 3-5 gigabits of bandwidth at their home for ~$40 USD/month?
Or a university club running an exit point using approved university resources? (I know my alma matter does)
Tor exit nodes are often just people hosting them on their own nickel, often at home. You can throttle the tor server to 56 Kib/s, and leave the rest for your own usage.