I'm confused, there are no numbers. Why do you all assume it sold well? How do you know 3rd place isn't 10k copies? Honestly, what the hell?
It beat out two extremely nitche rts games. That isn't saying much at all.
Put some numbers with it, then you can say it's impressive. Be realistic. Sad that I have to point this out and that I will be considered a nay-sayer for taking this for what it is.