I have a Raven and Legend Tee that are White but I've noticed that the darker colors seem to be more prevalent.
WARNING:
You are no longer who you were and tomorrow is now yesterday. In the event of an emergency, do not become alarmed. Move Quickly to the nearest exit.
I've got lots of white t-shirts from parks. SFDL, Storm Runner, Hershey (diff shirt then storm runner),a light blue one from PKD, a white alpengeist shirt.
But yes, I do notice a lot of dark shirts...my Mountain Creek shirt, CamelBeach, and Knoebels shirts are all darker :( Not a fan of complete black, but oh well.