Never, ever buy those 3X things.
Even if NG stays flat, UGAZ will be going down gradually.
The only thing that I found 3X does not go down much is the FAS.
I guess FAS holds some really financial stocks, which
have dividend. The fund manger of FAS uses the dividend to
buy call options for some financial stocks. When financial stocks
are going up, FAS will go up more because it also holds call option.