I think the moral of the story is letthebuyerbeware.
我想这个故事的寓意是提醒购买者当心。
《柯林斯英汉双解大词典》
2
In the financial world, however, it's all a matter of contracts, payments and letthe 'buyerbeware' - in this world you only get what you pay for, and sometimes not even that.