I'm running a very cost-effective and high-bandwidth VPS that is dedicated to acting as a relay, and am not even breaking even with this, even though it's been sitting and increasing its consensus fraction in the network for months now. I might be shutting it down very soon if I run through another billing month as a loss.
That's the point. I'm running the relay for fun and to support the network. I'm planning to run a hidden bitcoin node as well, but not to make direct profit, but to support.
It's running on a low power MK802 arm device, 5 watts 7mbps up/down.
I consider everything donated as a nice tip, not to make profit. Although it would be nice to receive some huge donations of course but I don't aim for it.