No it's not wrong... I charge my 22yo son $50 a week rent and he also chips in for the water, gas and electricity bills when they come in... It has taught him the value of money and he has also started to save his own money instead of wasting it like he did before he learn't the real value of money. He was always under the impression that life was easy and he could just cruise through life and now he has grown so much and now respects himself and other people. It will mature him and make him think more about life in general and that it's not always all about him and that there is actually a real world out there.