While you may not like it, keep in mind, volunteering is on a VOLUNTARY BASIS. No one is required to volunteer. And, it's stupid to single out the big name handlers. There are plenty average people who choose not to volunteer for one reason or another. At a 660 run trial, that is a lot of people. A very small fraction are made up of people who choose to volunteer. While it might be nice for everyone to volunteer, it just doesn't happen. I'd bet maybe only a quarter of those entered choose to. Despite it not being a popular opinion, they are right. They have paid to be there, and if they choose to spend their time in a way different than you, that is their right. Until working at a trial is required, you can't make them do it, and can't be upset that they choose not to do something that is voluntary. I have also seen my fair share of big names helping out at the trials.
Also, in my experience, there is no larger number of elitist acting big names than in any sampling of people. The majority I have dealt with are nice people who are like you and me. There to enjoy their dogs, and the sport of agility. There will be the few in any crowd who are elitist acting.