Well, IMO the "seasons" have more to do with cycles and diet than anything else. Prof BB'ers will run thier agressive mass building cycles with huge amounts of calories in the "off" season. They will look bloated, and fat, and do very little cardio. In the "on" season they will run lots of cutting agents, and get into contest shape so they can step on stage looking freaky.
I don't do this for my family, my friends, women, accolades, pride, or ego. I do it for me and no one else, its just part of who I am.