I'm sorry the structure of the tourn did not meet your expectation but they've been playing this type of or similiar structure for YEARS at a lot of the circuit events all across the country.
Before entering a tourn I always suggest folks scope out the tourn or cash game they want to sit at before entering so you know exactly what you're getting yourself into. When you get down to the casino and things are not to your liking then just bail and wait for another tourn or another time to play the WSOP. The WSOP circuits aren't the end all anyway. And they go through Tunica a lot also so if you miss it then its not the end of the world either.
The 15,000 starting stack is an illusion if you're thinking this tourn is going to be slow and you can hang out and wait for a strong hand. That's not what this is. The ante and blind structure are there for folks to fight tooth and nail for almost every hand from the start. What I mean is the blinds aren't like 100/200 or 300/400 but 100 then 300 or 300 and 500 for the BBs. There is a big difference and with the added antes started from the beginning of the tourn, they want you to fight and not relax in this tourn instead of waiting for a hand. The other thing is its a rebuy, meaning they give folks incentives to play aggressively for pots by letting them back in.
You're going to have to open your range up, battle for pots and try to figure out where you are in hands and gamble. There isn't an early stage of this tourn like you're counting on but begins with a middle stage strategy and when I think about it is more involved on the experience side especially if you're going with only one buyin.
There are strategies for this type of tourn and they can be a lot, I mean, a lot of fun if your middle stage tourn game is there and you're prepared to rebuy, ie you've got the
bankroll for it. Best thing is not to get discouraged from this minor setback, it happens and continue improving your game. If you're really mad, I mean really mad then I wouldn't blame anyone/anything but focus on a way to improve your
odds of doing better next time by improving your middle stage tourn play with antes, look at rebuy tourn strategies on Youtube or in books and keep improving!!
I was trying to think of a tourn that might help you get some practice but all i could come up with is Advanced Poker Training site that has bots that you play against and I'm thinking you could set that type of tourn structure up and play that to get more practice but its an expensive pay service of like 20-30 bucks a month.
Another alternative perhaps could be the uber low guaranteed tourns on ACR like $1000 guaranteed but I'm not sure on those since I haven't played those. I just played in the Evan Jarvis' 6 handed Friday $250 freeroll on ACR and that's at a faster pace than your WSOP structure but you're going to have to open up your range in those type of tourns and learn what hands you can go with.
I went in with Tens yesterday and ran into QQ and got booted uber early while I was watching Evan as he went in with QTo preflop then turned a boat, lol. and I'm pretty sure he just didn't do it on a whim being 6 handed and that particular tourn structure. So there is a strategy and the hand ranges are going to be different than what you're expecting is my point.
Ask Evan if he has any pointers for rebuys and quick paced tourns, he might tell you to go to his webpage or might take the time to give you a more in depth response if you're specific about something, you never know.
Overall though, its your job to figure it out, make the adjustments and understand that even if do things perfectly that you can still lose, that's just the nature of the game shown by my example and Evan's hands. So do everything you can to prepare yourself by improving and preparing for that particular type of tourn and make sure your bankroll can handle your buyins without thinking "I could have done xyz with that buyin money", what a ripoff, lol, no, no no.
Stay positive and keep going!!!