I knoooooowwwwwwwww that.Not Amazon's own action to put these three items together though. I don't think the actual people behind Amazon are intelligent enough to put that together. Most likely it is the result of numerous site visitors all purchasing these items together upon recommendation from friends or forums like this, and then Amazon's site algorithm started automatically lumping these items together. Just like "recommended ads" based on search terms or websites visited.
Just food for thought with purchasing trends, etc.