[Nextgrid]

Well, higher prices not only allow for people to be paid decent money to review the ads manually but are also a bigger risk for any scam operation as not only is it more difficult to obtain & move that amount fraudulently (you're not going to be able to buy a TV ad with a stolen credit card) but they also have much more to lose should their entire operation be discovered (presumably, a TV network discovering a fraudulent attempt will report it to the relevant authorities and will not just give the money back).