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I get that - but at the same time you must also think about that there need to be someone to buy your game in the end. And a lot of ppl taking advantage of such promotions - free keys for everyone, no questions asked etc are not really intrested in your game nor will remember your company. Not to mention potential multiaccounts etc. Then in the end when yoiu finally release your game, put it even cheaply for 3-4$ on Steam you will quickly find out that there are few hundred people offering those free keys they got from you on trades for a fraction of your asking price. And a lot pof your potential buyers will go to them instead.

Bot to mention what logistic nightmare it's gonna be to deliver on your promise as you don't gather any contact info - so you cannot just spam keys via email, SG doesn't have PM system - so you will basicaly have to add and communicate with hundreds or thousands of ppl manually via steam.