These offers might be more tempting if the data offered was more. Is a hundred MB for signing up for some recurring subscription worth the possibility that you could get billed $20-60 if you accidentally forget to cancel? There are offers for buying things from well-known vendors via their websites, but again, the MB per dollar (most average around 1MB per dollar spent) are so low that its not really worth the time or effort.
Josh Skidmore about Data Perks