I need to evaluate a marketing perspective for a videogame in order to predict its income, sold units, etc. Since this sounds like quite a bit of an impossible task, I thought I could collect some statistic for similar games in order to have an idea.
Is there a way which I could figure out selling statistics about games on specific platform? For example collect statistic for game xyz available on Steam platform or game abc available on HumbleBundle.
I think that could be a good practice to achieve this goal.
EDIT: recently was published SteamSpy, which offers a lot of statistics about games on Steam platform.