Matt-
No doubt QQ vs. AJ is a big favorite, I just wans't sure if you thought about the fact that the hand does lose. Personally, I don't think AJ sucking out on you is that tough of a beat. That's easy. Maybe I'm just used to people calling all sorts of bets after seeing 4 cards and hitting 2 or 3 outers on the river. Those are bad beats not AJs vs. QQ preflop when chips having been moving by everyone all tourney long. What was the situation, were the AJ and T8 guys short stacks, did they have to move because the blinds were eating them, were you bluffing a lot and AJ didn't want to be pushed around anymore, etc. More importantly, what are the odds that QQ wins against two unknown random hands or one random hand and one hand from a decent player? What are the odds that QQ wins against two players, AJ and T8 with all three players seeing all cards? The point I'm making is that the odds have whittled down a quite a bit when you account for the entire scenario. A lot of people see hands like QQ and think they should win 90% of the time and it's not even close.
When you first mentioned the structure I thought it sounded bad and posted as such. It appears that it promotes rebuys and fast play. Does the house take a cut of the rebuys as well as the initial fee? Many don't but if this place does, it could be one of the reasons why it is structured that way. Just consider it a more expensive tournament since it appears that it will be difficult to win unless you accumulate chips early.
As I mentioned, if you think your edge is so great that you are top 5 in the room, rebuy 'til they stop you. Regarding the all-in bets preflop, if I'm going to get multiple callers, I want no part of it. It sounds like these guys could have ANYTHING from AA to Jx so how do you know when you have the best of it. It sounds like a fun game but tough since you can't move these guys off hands. Are you trying to bully unbluffable players?
I would probably try to isolate preflop with big pocket pairs and with other stuff AK, AQ, KQ, etc. I would still raise but just a bit and not overplay the hands. If you miss and someone bets, muck the hand unless the pot favors you hitting one of your six outs. If you miss and it's checked to you in late position, will they fold to a small bet, will they bet their pairs, if not check it and see another card. Will they call big bets post flop if they miss or have medium/bottom pair? Check out a flop and if it hits then push. If you miss it sounds like you really only have a few options, go all-in or check. A small/meduim bet will not get them out even though you may have the best hand so all you will do is bleed chips with those big hands that miss.
Are the players aggressive? If not that is GREAT!! It makes it easy to get away from hands post flop. If they like to bluff then it is a bit more difficult since you can't put them on a hand.
The players do not sound like good players based on your description but the fact that there are so many of them makes it a tournament with a high variance (meaning you will lose often just keep playing and eventually you will win). This reminds me of the online .5/1 games...I'm not sure I could beat them. It's not really poker, almost the entire table calls all the way to the river then the pot gets pushed to the best hand at that point. Bets and raises get NO RESPECT.