I think it is great to make your kids work for their money. Ezzy had a little waitresing job/pot washing job int he local pub from aged 15 onwards and she has had part time jobs doing that ever since. Before that, if she was skint, I used to give her a little extra in exchange for doing the ironing for me.
Gav is now 15 and just leaving school..he gets an allowance but if he wants extra, he has to work around the house for it (he is lazy and sometimes says he would rather go without! Doesn't last long though!) but he is just about to enter the working world hopefully and will learn the value of money.
Up until now, we have always paid for the kids holidays, generally given them so much spending money and expected them to contribute anything extra.
things changed when Ez turned 18..she mostly pays herself and we help her out a little and things will go the same way with Gav once he starts earning.
Kids need that discipline. I had jobs from aged 14 and worked for everything. My parents gave me the child benefit as my pocket money when I was 16 as I was staying on at school andm y mum said she would have lost it anyway otherwise if I had left. I had to pay for everything out of that £7 per week. My travel, clothes, dinner money etc..so of course it needed topping up and I had all sorts of jobs. Rob was the same..he went down the pit to work when he was 16. I don't see why our children should have it any different.