I am puzzled ! In the States, all sold items can be return for an exchange or a full return within 1 week or two with no questions asked. It is the law there.
One can buy a camera in a sealed box without any checking and can rest assure of a refund if requested.
just so you know, that policy is also not foolproof, got other means of abuse.
of course consumers are happy... you can don't need to rent lens already... want to shoot wedding? BUY A D3, BUY TRINITY LENS.
after the wedding, RETURN TO SHOP.
RENTAL FEE = ZERO
QUESTIONS ASKED = ZERO
i do not agree with your statement that this is something that should be implemented in singapore. i have seen loads of cases of abuse in other countries due to overly liberal consumer rights and for the sake of our local businesses, due to the fact that singaporeans are very kiasu.... i think something intermediate will be better.