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***THE PETS AND ITEMS GIVEN AWAY MAY NOT BE SOLD FOR ANY PROFIT WHAT-SO-EVER! "
^This is a condition that you are not allowed to apply. Once something belongs to someone, it is theirs to do with as they please. If you were simply letting them borrow you could say this, but you cannot put this condition on something that is being given, sold, traded, etc. and will belong to the other person in the end.
You may not "shame" anyone for selling something once it is their property either.