Has anyone done the calculation yet?
If you look into the CMW standings (as long as you have no victory points) you'll see your rank > 1000, which means there are over 1000 active users having at least 1 victory point, looking for Coinz Keys.
Of course we do not know how many users there are, but let's just say it's 2000 active users looking for Coinz Keys.

300 Coinz Keys per week divided by 2000 users means on average a user finds one key every 7 weeks.
Since 1 key will allow the withdraw of 10,000 Bitz (or any other currency) this means it takes on average 7 weeks to get to a minimum withdrawal and since that's just $1 we can calculate the average amount of money this site pays per user will be somewhere around

$1 / 49 days ~ $0.02 per day or $0.60 per month

and it doesn't even matter how diligent some users may be, even if you win the war game every single season, on average you won't get paid more than $0.60 per month.