well yeah you should be stricter .. but in the other way .. rather than practice "love, nurture, harmony.." and other hardly perceivable things you should plainly deprive them of any money, if they want to drink beer, use mobile phone, get out with friends on parties and so on, they have to earn you trust or earn money themselves, that'll teach 'em not waste their time and in general 'd be helpful for youngsters to understarnd commodity-money relations ..)