Most of us really wanna know about the sales figure as this will give us idea how future is hold for this game (like patches and stuff)
You have to address this question to Maximum Games. We don't have this information
SteamSpy says 2000 owners for the PC Steam version, which is not so bad when you know the publisher did a pretty bad work with near no marketting and delay because of the consoles versions.
I don't think patches are related to MG (nor the level editor), at least for the PC version. Whatever they decide soon or later for the game, Alexey could still keep support the game.
It's not like the game is full of bug anyway. The majors problems are the random crashs and some localization problems. Once those will be fixed, the game will be pretty solid.