What was the question again? How can you get more BTC per rig? How about a slightly modified rig?

The business plan goes as follows:
Set up TOR exit nodes for BTC. Everybody who wants to run his own TOR exit node but fears the trouble now can pay you to run it. The management is insanely simple from the user's perspective:
* Send coins to XY
* check at myTorNode.com/XY how much traffic it is handling

Many BTC early adopters like the TOR project and might pay coins easily.