it's about the principal of what he's doing not the $2. getting hundreds or thousands of people buying the game twice because he doesn't want to give us steam keys is exactly what he wants so he can double dip and earn thousands of extra dollars. he just doesn't care to support those who supported him and would prefer to take their money
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.