Rest of the year they result in big losses. In an uptrend they just kill you, can't hold these things. UVXY is the worst for decay, buying puts on it after a tank-off is always a winning strat; SPXS is almost always a loser, and from april - aug SQQQ, UVXY produced -90% 'gains', lol, after SQQQ collapsed to <$4, it reverse split 5:1. When it decays back to $4 in a few months it will split again, holding it for six months would result in nearly 99% loss! If you buy these ETFs you're trading futures!
Best post ever from hungry_hippo, note the price at inception, $3m is not a typo: