I would have to say anybody who holds these 3X ETFs for more than... an hour, is brain-damaged. Or needs to be parted with his money as soon as possible.
Take only a pretty pedestrian (nowadays) whipsaw going from 100 to 95 the next day than back to 100 the next day. That's -5%, +5.3% in a 2-day succession. This translates to -15%, +15.8%. The 3x ETF will go from 100 to 85, then back to 98.42.
Congratulations, nothing happened in the market but you gracefully handed over 2.25% of your position in 24 hours. Where the money ended up is anyone's guess. Some accounting line somewhere.
A less mundane whipsaw of a drop of 20% followed by going back up to the prior level the next day will hit you with a 30% loss, again, in a market where nothing happened.
There's a point where you actually have to tell people, "you know, at this point, you might as well go ahead and just use plain margin and deal with margin calls. It will be less dangerous for you".
This is the latest money train for Wall Street. The decay in the price series guarantees an arbitrage that they can profit from. I'm expecting we will have 6X, 8X and 12X ETFs eventually. Next thing you know you'll hear stories about some Joe Idiot who became a millionaire betting the farm on a completely run of the mill stock market daily fluctuation.
It kinda reminds me of the housing bubble really... I mean, no offense, but blackvault's thoughts were immediately "awesome! how can I lever this even more using some form of OPMs?". This will appeal to a certain demographic who have nothing to lose but everything to gain. Just like housing - all you have to lose is going bankrupt but if you hit the jackpot on a leveraged ETF you could make millions!
Just look at SKF. It's a 2X ETF but you will have made MORE money if you just shorted the underlying index long-term (+38% vs. -47% for the index YTD). Anyone wanna guess where the 9% accumulated error went?
These are good as trading vehicles, but the amount of slippage due to the price series is so great you can't do more than intraday.