One other thing, sours are pretty seasonal. Great in the summertime on a hot day, especially if you have cyclists or the like in your area. Nothing beats a nice tart, SLIGHTLY salty gose after a long ride. Salty like a Gatorade, just enough to be thirst quenching. Up north, once the snow flies hardly anyone wants to drink them. Not the people off the street, but just the hardcore sour fans. Now a double IPA? Serve it year round. Sours just don't make consistent money for a brewery year round.
Now @wilcolandzaat might be onto something with porter... remember that England exported more porter to India in the 1800s than pale ale. Must be ok with a tropical climate! And absolutely delicious when the temperatures drop.