Most likely it is almost impossible to invest 1400 Steem and earn 1000 Steem of pure profit in 21 days. Size of the rewards decreases every day and those rewards are generated from the resources in the game and shared reasonable with all the participants. If drugwars have a small payout budget and there is a lot of players which are not investing anything anymore, then sooner or later it might appears some problems with fulfilling your expectations. Without a smart management plan about spending some Steem during the first steps in the game, it is possible that you can lost a lot instead of earning. I have also heard about guys which made a full cashback in 7 days, so everything is up to you and your investing plans.