Whenever I'm in Champion Select and I see like an afk person who won't select his champion, I close my client to put everyone back into que. It doesn't count as a leave and I don't have to suffer a 4v5 defeat.
Plus the person may be deciding which role to fill to balance the team, because everyone else rushed to their fav champs without thinking. The person may also then have to re-spec their masteries as a result of this.
The only way I would consider doing this is if there were 10 seconds left.
If I had a dollar for every stupid person I've come across, I'd be able to buy China. The official grue master of EP.