Reply #3: Your last point is the best:

[NewYorkerfromMass]

"You should expect that demonstrations of DRE election systems, whether in a real election or not, will go smoothly. Any manufacturer committed to making a sale will staff these demonstrations by knowledgeable contractors and/or employees. This is staff that you will not be able to afford in any state-wide implementation."

No one can imagine what can possibly go wrong with these machines, but they should remember Murphy's law. And they should realize the machines simply introduce more opportunity for problems to occur.