I'd like to see your math on that. Because, it makes absolutely no sense to put a roof on stadiums that don't have rain problems to begin with. Let me turn it around, why are you playing favorites and punishing teams economically by forcing them to build roofs on stadiums that don't require them? Roofs cost hundreds of millions of dollars and should only be built where they're a benefit. And it's not a benefit to build a roof in California. And there's a cost to a roof. Let's say the A's, which is the only team in the next 30 years likely to be affected by this "rule", find a great spot in San Jose with a great view. A view that makes the stadium as aesthetically pleasing as the Giants stadium. San Jose averages less than 3 inches of rain a year during the baseball season.Why should they be forced to obstruct that view and damage the experience of fans for 80 games a year as opposed to perhaps one game a year where a roof would benefit? It doesn't take much of a cost benefit analysis to think that's a drain on revenue which impacts the profit of the team and the salary of the players. You make a rule, you make a rule that holds up to common sense and is an economic benefit. There's no economic benefit to put a roof on a stadium to keep out rain when you're in a climate that averages less than, say, six inches of rain during the baseball season. Otherwise, you're throwing away money for no gain. And, honestly, it's much too late to enact such a rule. The A's are the only team likely to build a new stadium in the next 20 years where a roof probably won't be built. The time to institute a rule to have any effect, would have been before the stadium building boom of the 90s and 00s, not now when it won't make a difference. What's more, since stadiums are almost always a private / public partnership, it's probably an unenforceable rule. I'd love to see MLB's reasoning for telling California what they can or can't build. Robert I don't need to do any math. If you can't see what a huge plus the roof at Miller Park has been and continues to be, and extrapolate from there the advantages of adding a roof to other stadiums, there's nothing I can do to change that. And MLB has been telling California what they can and cannot build for many, many years now. They're called Universal Ground Rules and they apply to baseball clubs in California as well as they apply to baseball clubs in every other state. Hence, the "Universal" designation. California just isn't that special, no matter how much you seem to want it to be. If you get to be commissioner, fine, no roofs in California. If I get to be commissioner, they'll have roofs in California or they'll have no MLB. Period. That's why the thread is entitled "What if they made you Commissioner?" as opposed to "What if they made you Commissioner, but gave RobertR final approval over all of your decisions?"