Judging by the $5.1 million dollars raised through Steam sales of DayZ, the game is a huge success. According to a series of 'tweets' from the development team, over 19,000 unique players signed in within the first hour.
The standalone, early access version of DayZ has racked up $5.1 million worth of sales in its first 24 hours since launch, with new players joining the zombie survival adventure every hour. 88000 survivors joined in the first 12 hours.
Bohemia Interactive's CEO Maruk Spanel revealed through his blog that after 24 hours 172500 copies of the game had been sold and 142403 players were online.
Source: GamesIndustry.biz