Dropping sticks while doing stick tricks is normal, but uncalled for.
Dropping sticks (or rather, having your sticks fly away) because it got caught on various parts of the drumset or hardware is avoidable.
Dropping sticks while playing is just plain bad technique. No gloves, duct tape, or grip tape will ever help you out - ask anybody around here, its the truth.
Being harsh but that's the way to help you not spend money on something that I personally feel is a gimmick.
I have sweaty palms too, perhaps not as extreme as some people, but I do have friends who can manage to squeeze sweat out by merely clenching their fists. To my knowledge, none of them have had any experiences dropping sticks while playing.
The Ahead gloves don't come cheap, and though some may argue that it'll help you out because it "absorbs the rebound and lessens the impact on your hands", I won't deny it, but my personal opinion is that it only helps if you're doing a full concert, or you have a low pain threshold.
Sweaty palms? No need for gloves. If you're holding your sticks right and playing normally, I don't forsee your sticks flying anytime soon, don't worry too much about it
Oh btw, you could try plum powder. At least I think that's what it is... the powder that gymnasts rub over their palms before they start swinging on the bars. It makes your hand dry and increases the grip. If your palms are really that sweaty, you could try this cheaper alternative.