according to this page on the official steam-works website [https://partner.steamgames.com/doc/features/keys], only 5,000 keys can be generated before they have to be reviewed on a key-to-key basis. and seeing as only 13 days after this game released on steam, it reached 1,000,000 sales, i doubt that would be an option.
i've talked to mike. he's genuinely a really nice guy. i feel like taking money from his earliest supporters just to be greedy is not in his priorities.