It's been shown that a brute-force attack on WPA2-Personal is possible in a reasonable amount of time. These successful attacks appear to be limited, however, to researchers who have the budget to afford the hardware, or the few experts who know how to debug and run their own WPA2 program in the cloud.
Assuming the resources available to the average hacker, are these brute-force attacks now feasible? what would be the estimated hardware cost to make a successful brute-force attack on WPA2-Personal?
400,000 PMK/s as said in the URL doesn't seem fast enough; what assumptions must these attacks be making?