I think the thing is, if you rely solely on one type of positive reinforcement it's probably never going to work. Especially if it's over done or not really needed. For example we may use praise, but we also communicate well, as well as teach our children to recognise their own achievements. For example I praised my children as toddlers when using the toilet properly but I wouldn't do that now because well that would just be creepy. I think it's more about showing appreciating in our house, as well as reinforcing a positive behaviour when they are unsure or are learning, as well as compliments... which IMO is good to learn. Nothing makes my gf's hearts melt more than when my 5 year old son comes and compliments them on how beautiful they look today, or how yummy a meal is. These are things he has learnt from his father as well as us showing him the same courtesy. I wonder how many adults would like to go through life without any feedback or positive reinforcements.