The " Vicious circle "
- Make Champion "A" Strong (OP) in a patch. So people start to play him.
- Make a Skin for Champion "A". So the people buy it .
- Nerf Champion "A" in next patch . So the the people start searching for new Champ to play.
- Repeat steps 1 to 3 with new champion . So you can keep that cash flow going .
Brilliant business strategy IMO :)