If you have two clerks, there's more of a temptation to resist, which could cause an escalation of the situation. And if it is a truly heinous act of violence, you just put more people at risk.
People price shop. There is no loyalty. They will leave you for a penny a gallon.
We're in uncharted territory. We're seeing more people going to prepay than ever before. I think we'll look back on 2005 and say 'Remember when we used to be trusted to pay for our gas?