Becoming an owner in the rarefied world of Major League Baseball comes with its own set of risks, as well as substantial rewards, not the least of which are huge financial gains when a team is sold. And with the colossal television contracts being negotiated these days for local broadcast rights, the value of teams can only go up, experts say. The sale of the team still requires approval by other Major League Baseball owners, who could take action as soon as Aug. Owning a team, while a vanity acquisition that shines a bright spotlight on the owners and their other financial interests, is still, at bottom, a business that can pay huge dividends for the patient investor. Today, there are few who can say this is a toy. There are a number of economic complexities involved in owning a baseball team, not to mention circumstances on and off the field that are often beyond the control of the owner and the franchise.