Im pretty sure that the game used to be around £10 in the uk (around $15 dollars). I got another copy in easter for£5.40.
You guys should seriously stop complaining about the prices. They are EXTREMELY fair prices, in fact, in my opinion, the game should cost $25 considering how much you can do with it.
This is discrepancy to some extent. But to be honest, you're being pedantic if you think a change in price by no more than $5 is discrepancy.
There's obviously a lot more demand for the game now that it's on steam. That's the only explanation for raised prices.
I hope my comment cleared some things up for you all!