Okay, so let's assume that you absolutely, definitely, must be there when the doors open to snag those elusive/rare/etc. items that will otherwise be scarfed-up by equally eager others. So what does that have to do with the opening time for the meet, at least as it affects the majority of attendees?
Meet opens at noon; you get there at 11:45. Opens at 10; you get there at 9:45. You go to sleep two hours earlier the night before; get up two hours earlier on Thursday morning; and haul your butt to the York fairgrounds. The meet isn't just about YOU, after all; it's about some 12,000 other folks as well.
I have noticed, though, that the throng of folks chomping at the bit waiting to charge into the halls has been somewhat diminished in recent years. There still are groups assembled outside the hall entrances, of course, but their numbers are much smaller than I remember from back in the late 1980s and early 1990s.
[Just an attempt to keep "York fever" going. I do love a good non-consequential controversy. ]