And if you hold out for 30, then you'll just add this to your stack of mistakes.
Both the fact that you're thinking in these terms ("come on, please let this one trade become the big winner that makes up for everything else") and the fact that you talk about "investment" with reference to FAZ pretty much guarantee that you will continue losing money.
FAS is for trading, not investing, it's virtually GUARANTEED to lose money as a long-term investment, your price target is unrealistic. FAZ has never sextupled before, even in major sell-offs, and while it could theoretically reach $30 (as much as the low 80's, in fact), in practice there is virtually no chance. If FAZ goes to 15 from here and you don't bail, you're a fool who will soon be parted from his money.
You don't know what you're talking about either. It sounds like you're both bad at math and you don't understand how leveraged ETF's work.
FAZ can get to 15 without FAS going to 0 - I'm not saying it will, but I am saying it's realistic - and there is no direct relationship between the value of FAS and FAZ (in the sense that "if FAS goes to X, then FAZ will go to Y").