I like rebuys sometimes, and I don't think you have to rebuy into it either if you're willing to gamble. With a short stack, you are more likely to get a caller from a big stack calling with weaker. Then again, it's just one more double up you have to win to make big money. I've placed in rebuys before without rebuying, but it's rare. I do think you should plan on doing a rebuy and add-on if you're serious about the tournament, but if you aren't, and are willing to gamble, I like them because they are generally shorter, and there are quite a few people rebuying a lot and pushing with junk that give good value.