We've talked here a lot about when +R becomes manipulation. In looking at the odd parenting site (no NOT the ones which teach you how to flood you baby to sleep in 3 easy stages.....) I've come across this one.
http://www.alfiekohn.org/index.html
The article
http://www.alfiekohn.org/parenting/gj.htm deals with this issue. I'm not convinced but have only skim-read it. For me it still all comes down to our choice of behaviours to reinforce. I like to think I don't/won't only reinforce those which benefit me. And I hope that Billy/Jak perform self-motivating behaviours as well. If I praise those behaviours as well then, true, I am still perhaps influencing them. But equally would not praising lead to some level of extinction? Hmmmm, I think maybe this could get silly!!