A guy I work with was a Rams fan and he said shortly after they moved Indy was marketing hard in St. Louis, even some news coverage. Said that the Colts stadium was closer to the St. Louis stadium than any other (it's like a mile or so closer than the Chiefs stadium). Said, now that they were abandoned Indy and the Colts would welcome them as fans.
Pretty funny and smart.
My coworker has mixed allegiances now, he doesn't want to be a Rams fan but he's followed them for so long and followed the players it's hard for him to not still be a fan.