Buried in an article about Joe Torre regaining respect for A-Rod is this juicy little tidbit:

And everyone presumes that Arte Moreno will offer A-Rod partnership as an owner to get him to come west to play for the Angels.

That's all the article says about it.  It's obviously pure speculation, but would it work?  Has there ever been a player in their prime that a franchise wanted so badly that they were willing to offer them part ownership of the team in order to play with them?