I'm currently mining FTC coins on my gaming rig (Nvidia 770) and I'm getting close to 10 coins per day.  I just ordered the R9 290 so I should be getting about 3 times the performance, or 30 FTC coins a day. 

30 coins x 30 days = 900 coins x $1= $900

At $900/month, that is a massive ROI.  I'll get the cash back for my whole rig in around a month if prices hold. I know I'm not taking into account energy cost, but even still, it should be very profitable. 

If I were to invest in 5 similar rigs, I could be pulling in at least $2,500 / month if not more after energy expense which seems like a no-brainer.

Obviously if the coin prices on FTC drop that math doesn't work.  Other than the risk of price drop, what am I missing? This just seems too obvious and too easy.