I don't care if people can pay to cut in line - it already happens in many places by virtue of flying business / first anyway.

I do have a problem with a 'trusted traveller' concept. There is no one I would consider 100% trustworthy. But wait, what about that 80 year old grandma? That army officer? The priest? Nope, nope and nope. Firstly, I don't buy the idea that terrorists have a 'look' - despite Hollywood's ideas to the contrary. Just because someone has a certain skin colour, is a certain age, or travelling with their child does not make them 'safe'. The 80 year old grandma? "Hey lady, we have your grandkids, and will kill them unless you smuggle this explosive through the security line and give it to our guy on the other side". The army officer, could he have suffered PTSD and now has a somewhat twisted sense of right and wrong, and his duty to protect? The priest - long term planning, sure, but it doesn't take much to become a priest.