There are definitely some people who are upset by the number 666. However...
- Very few, if any of them, will be roguelike gamers. They tend not to be the kind of geeky critical thinkers that this type of game attracts.
- I really don't care if these people do get upset.
...all the same, I must grudgingly admit that this is a valid if very minor concern. Even if my attitude would be 'to hell with them' - literally in this case. :)