Why don't baseball stadiums have retractable roofs?

The Rogers Center (Toronto), Chase Field (Arizona), Safeco (Seattle), Miller Park (Milwaukee), Minute Maid Park (Houston), and Marlins Park (Miami) all have retractable roofs. The Rogers Center (formerly Skydome) was the first, and it’s designed to be mostly closed and use fake grass; the newer ones are mostly open and use real grass. read more

The latest trend for indoor baseball stadiums is convertibility. In locations where weather can be an issue, closing the roof on a rainy, cold, or extremely hot day can significantly improve the game day experience for the fans. Several of the stadiums listed above have retractable roofs. read more

I don't think teams should have to add a retractable roof to existing stadiums. However, I do believe that MLB should mandate that all new stadiums being built from this point forward have retractable roofs. It would enhance the fan experience and certainly help to increase ticket sales. read more