there is no harm in doing so at all. as said previously, it'll help him learn and understand so once he feels he is outgrowing living with you, he can move out with confidence (and you'll be reassured).
it'll be a lot worse a situation if he doesnt learn, then he leaves for whatever reason, then comes back mounted in debt after being kicked out from his lodgings after not handling his finances... but thats worst case i guess
best to sit down, talk about it, explain why its important. if he gets funny about it, dont push him into it, let him think about it, then come to an agreement. either way, he's going to need to learn at some point - and best to learn at the hands of his parents than some c**t landlord who may fleece him
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