You cannot be so sure that it is a scam as it is making a payment on regular basis so it would be too early to make a judgement that it is a scam. The people are against it as they are not able to digest the pay out they are making and surely they will say it is a scam but it might prove to be the best campaign in the future if it is genuine as its payout is the maximum.
I haven't invested or looked at any of their investmentment plans but in the scam accusation thread , there is enough proof to show that they have faked a lot of things on their website. I couldn't even find an ANN thread for their investment site, which makes the way they run the site extremely fishy. However as for investments , I have seen a lot of scams making payouts in the start and then stopping after they make enough money, so you would want to be careful where you invest your money.