If there's a reason to come back other than feeling personally involved in the group on that level, then why pull wool over people's eyes to maintain attendance when you can actually just be worth coming back to?

Enjoying and wanting are different- I might genuinely enjoy services more than sleeping in, but only choose to go to services instead of sleep in if I've committed to going.

It also seems likely that personal involvement magnifies other things (that is, you can't separate them in the hunt for efficiency without losses), but I'm not as sure of that one.