While it might be fun to completely dominate the world-wide market, there is a hefty price to pay for the economy that surrounds them. If most of the revenue of this country only goes to Disney, Coke, Pepsi, McDonald's, Kellogg, etc, then soon (if not already) they will be able to completely sensor our lives. Disney can tell ABC what news they will be able to broadcast, Coke and Pepsi will be able to set the only flavors of soda that the consumer can drink, and even Kellogg and other food companies will be able to choose the only options of ingredients you can eat. And if some small company decided to 'rebel' and challenge these big companies, then the companies will either buy them out or silence them in some other way.
So, it may be fun to make money off of hotels on Boardwalk Avenue or Marvin Gardens, but on a larger scale, there could be dire consequences.