I can only speak for the people I quest with and a few others. If you need nothing in MoD why even run it? Most people I play with only login to help guildies. We need nothing, want nothing, have anything we want or could get. The point for logging in would be to get a challenge a real challenge, where the reward would be the challenge itself.
Me, personally if it was really challenging I would run them until I do them so much I get bored of them. Which could be hundreds to thousands of times. Or we could just login once or twice a week just to chat and see if people need help with things. To me playing more would be a benefit to all but without any real challenge what's the point?