Resort transportation. It can be very convenient to monorail to MK/EP - a 5 minute walk from your Poly room, take a boat to DS, skyliner over to Toppolinos, let your party come and go separately without excess rideshares, etc. Somebody driving to WDW may not care at all, or they may regret being designated driver if they want to have a few drinks during Harmonious or need to chauffer SIL back and forth midday after she spills a
pickleshake on her dress. So it can range from invaluable to doesn’t matter personally. I’ve looked at some offsite options and they’ve never saved enough to compensate for parking fee, park parking cost, weird and sometimes costly shuttle schedules, lack of independent logistical options for our party, or abundance of rideshares… but I do see it totally making sense for other people because their circumstances certainly differ if they have a lovely timeshare nearby, stack of hotel points to burn, small party, short visit, and more..
The ability to buy G+ at midnight is open for all ticket holders, not just onsite guests.