I was dreading this question for a long time. I was asked that and gave a rather simple answer but I want to revise it. I gave it a good thought and have decided to allow bots in the game under a few rules:

1. They must not be the main focus of the game.
2. They must be clearly marked as a bot.
3. They should be used sparingly.
4. They should not take away from the experience of playing the game with real players.

It must be said that you should try to get players to play together through methods like recommended schedules. I will try to help out by posting my own recommended schedule and open invitations to play.