User blog comment:Deshiba/Ban champion X!/@comment-5514182-20130811184145

Well, in competetive play, I've seen teams picks their bans with a single opponent in mind. They would ban the enemy jungler's top 3 jungle picks, forcing them into a champion they were not as familiar with.

Imagine if there were 15 bans. Right now, there are only 14 Ranged AD Carrys (Jayce, Kennen, Urgot, Teemo, and Lucian don't count). A team could realistically ban all ADCs, and what could the enemy do if they had not plan of action?