Genuine question - what would be the benefit to fans of knowing this information? Speaking personally, I don't feel that knowing how much we bought Gross has any significance other than satisfying my curiosity. I'm not trying to be clever here, honestly. I just fail to see the need for it.
A feeling that the game is relatively honest and transparent.
When you look at the cesspit of corruption that is FIFA, at the supine arse-licking of a lot of the media and at the greed and venality of agents, it's hard not to feel that supporters are constantly taken for idiots. Transparency about what their club are spending would go a small way to redressing that.