IANAL. In cases like this I like to suggest to remember Microsoft's case with IE bundling. The mere act of using monopolistic power of one arm of the business

IANAL. In cases like this I like to suggest to remember Microsoft's case with IE bundling. The mere act of using monopolistic power of one arm of the business is enough to trigger anti-monopoly laws. Hiding listings that are found cheaper elsewhere would be very much suspect under these laws.