Many of us do because we prefer the challenge of trying to build up a region from scratch. I find it incredibly boring knowing that I am going to win on day 1 and have left several cities because of it
so there you go \(^^)/
no need to have so many complaints about people who join winning regions/cities/ companies by many ways (mainly by invitation, contacts from other players)!!
you find amusing going to deserted areas, some of us find amusing to go join friends and players we know in another winning.
there you go, everyone is happy!