Wow, GamersGate site coding is a total turn off.
You have to verify your email before purchasing anything. Multiple attempts to receive one of the e-mails ended is failure; wasn't sent to main inbox nor spam.
Next day, tried another address. This time I received the verification, but site can't log me it. I've used Steam, Green Man Gaming, Impulse, Direct2Drive, and Origin along with a handful of indie bundles without a single problem. Yet, GamersGate won't even take my money.