I agree with all this, really.
Long story short, my mother didn't have much in the way of savings or money when she had me or my sister. I grew up relatively poor throughout my entire life, and nothing much changed until I was around sixteen/seventeen or so.
Now, when I started part time work as a teenager during college, I had to give about thirty percent of the already miserly wages I accrued, and for the brief periods in which I worked full time, slightly more.
Although I agree with the sentiments of 'their house, their rules', and 'they looked after you since you were born' etc, it still feels like quite a bum deal. I never any real luxury, even on birthdays or major holidays, and yet there I was shelling out more money than I'd get altogether on both occasions every single month.
Personally, I would never charge my offspring rent to live in the house they grew up in, unless of course they were for some reason living with me as adults, working moderately well-paying jobs. I'd just feel bad in all other scenarios.
Also, when I did eventually go to university, I inquired to my mother as to if the bills had increased whilst I was away (as I didn't go home at all for the first three months or so), to which she replied they were virtually the same. Add together the fact that I never did eat much or waste electricity, I can't fathom what the supposed 'rent money' was for. To echo the sentiments of others, it just seemed like money pinching because it was possible.
Oh, and bump.