Wikipedia:News agencies and fair use

Wikipedia's non-free content criteria requires that fair use images "not [be] used in a manner that is likely to replace the original market role of the original copyrighted media." We have all used the "low resolution", Wikipedia is a non-profit, and other excuses that it won't affect commercial use before, but there are cases where a specific class of photos cannot be used for illustrative purposes on Wikipedia, even under fair use.