It is not that he wants the other guys tool but to borrow it, use it and then give it back.
It is a sharing system between men, sharing tools and toys, then decide to get their own so they can share with the next guy that is admiring his tool.
It is not that men don't appreciate their own tools or get good use out of their tools, but there is always some guy with the better tool, the bigger tool that gives better performance. The other guy's tool might have better attributes, dimensions, be stronger and get the job done with better ease.
It is a vicious cycle of he has, I want.