1) Where does the other 50% go? And what "cancer research"? A recognised charity?

2) It's a simple message, but that means it's not quite accurate. The people making the product make a profit (noe of which goes to cancer research); the people selling the product make a profit (none of which goes to cancer research); so really it's only 50% of the affiliate fees that go to cancer research, right?

3) the mix of different colours is weird and jarring. (And yes, I appreciate that compared to Amazon's own website being jabbed in the eye with a stick is more pleasant.) There's red, grey, blue, black; then the links blue and purple.

4) I dislike the dropshadow on the curecart sign. I thought my eyes had gone funny.

Good Luck though, it's a neat idea.