7000 xpers are required to get one $20 amazon gift card.
Lets suppose, if a person earns 1 xper in 1 minute.
Note: Actual time will be more than that.
7000 minutes = ~117 hours of GaG activity is required to get $20 gift card.
So, ~117 hours of GaG activity gets you $20 gift card, considering that 1 xper is earned in 1 minute.
In real life, a person could earn $20 in approximately 2-4 hours easily.
They should remember that GaG purpose is to help each other. These gifts cards are just a secondary reward which no other forum offers.