There is an interesting if America focussed debate on this on another forum. Some say its offensive some say its good 'cos it keeps the paps and fans and other hangers on out of the main terminals.
For me I would ban private jets and any form of private terminal and absolutely no special arrangements for security or boarding. like Limos etc.
Not because rich folks shouldn't have that but they have the power and influence to sort out the often awful experience at the airport for the rest of us. If they want to pay for a box at Stamford bridge or Royal Ascot or $5000 a night hotel thats fine but airports NO, they have to travel with the herd for security reasons and to push those with influence into making the process work properly for all of us