All these profit/ROI estimations are useless. We are clearly remember advertised earnings/roi level of vcu/bcu1525 back in May-Jun, a lot of gullible people fell for those beautiful numbers and spend tons of money.
Nowadays fpga mining hardware market is flooded. vcu/bcu1525 owners barely seeing $5-6/day income, this is 2+ year roi atm. And bcu1525 profit for sure will be more and more cannibalized by cvp13, and all other upcoming fpga boards. And we are not even taking into account probability of algo forking on big altcoins
It reminds me how ASIC manufacturers advertising their new devices.
Showing current profit level, not taking into account growth of network hash rate and difficulty, which are skyrocket after the manufacturer ships thousands of brand new devices to customers. After a few months these devices barely cover electricity cost and become doorstoppers.
I want to repeat: nowadays mainly only miming hardware manufacturers and hardware resellers earn money in crypto mining  sphere.
This is a game where  miners will always lose, doesn't matter what kind of hardware: ASICs, FPGA or any other specialized hw
In near time we'll see more and more coins forks with asic, fpga resistant algos.