Im still holding off on saying that GM is a scam. But I defiantly see a steady decline in my payouts. That is due to the difficulty level increasing everyday, but by how much? We'll have to trust in GM to give us the truth because I don't have the ability to fact check their numbers. Just a simple matter of trust. However I have invested about $10k in to GM and have mined about 2 BitCoins so far which has almost paid me back my investment. So I'm not too worried about GM being a scam. But crypto currencies in general are based on trust, but we all have to do our own due-diligence to make sure whats right for us.