Family $hit

Ok this is going to be kinda serious tonight.  I have a question, comment if you want or just leave it at what it is a question.  When do you stop supporting your kids lifestyles and give them the boot, and make them pay for all there expenses in life.  I know this is probably a gray area for alot of people and never really talked about.  I dont have kids , and I have know idea what I am talking about, but I am a believer in tough love to a point.  I wouldnt kick my kids out on the street, but I would encourage them to move the hell out and live their own life.  I just think out of respect my kids would leave, and make own way in life.  Alot of us didnt have it real easy growning up , but we made due with what we had. I believe that I am successful due to the fact that I wanted more things out of life than what was given to me.  Maybe thats just it, parents today give their kids everything in life, why leave.  Now is that the kids fault for taken advantage of their parents or is it the parents fault for not knowing when to stop and say no and mean it? Ok I am done