Warning: This topic is a bit more advanced:
So, I am well aware of the decay effect, and have personally learned from it. My question for the esteemed board is:
What about the strategy of buying put options on the underlying triple-leveraged play you are bearish on? I have actually done this (currently have puts on TNA, as a hedge), but just doing it as a short-term thing. In theory, if the decay occurs, your puts should profit more than an investment in the corresponding inverse index. I understand that arbitrageurs would be all over this (and probably are already) if it were a no brainer, but I think it has some merit, if decay is a big concern. Once again, I only use this for short-term hedging, not as a real speculative play.
My assumption is that the magic hand of the market ensures the puts are priced to take this effect into account, and I'm really no better off. But, I would like to hear thoughts on this.