If the site was surely making profit, there would be no fun for players 
That guy was pretty lucky! Playing 0.03 repeatedly on red looks like "engineer" no?

Chat Lotto is a random prize you can get in the chat 

look at the next img:


But lotto is only for players, you must gamble 0.01 to claim that lotto in the next 24 hours.

Seem cool, especially when you win 0.6BTC!

Can I find the rules somewhere?

Have to talk in the chat? How often is it awarded

People that are active in the chat box may be selected to win some bitcoin after bets are recently played. However, this prize is currently reserved to players only - if you have not gambled 0.01BTC within the past 24 hours from a single address, you won't be able to claim a prize. You can always donate a prize to the moderation team by posting the 1ModTip address provided rather than your own. The contents of that address are evenly distributed with the staff.

Useless commentary about the chat-lotto or its prizes can earn you a ban. The chat used to suffer from a lot of useless clutter chats such as lotto-begging and 'grats'-spam after any win. The moderation team has worked hard to fight that problem and will continue to do so indiscriminately. Before you chat about the lotto, consider this: is the event so unusual that it warrants a comment? If it isn't, then you probably will be banned for chatting it.

Remember the standard chat rules apply to everyone universally: don't beg or ask for sends; use English only; show respect to the site, staff, and fellow players; don't post repetitive, useless, or nonsense chatter; don't post your address unless asked for it. Bans are usually short but repeat offenders may be removed from chat for a long period of time. Moderator decisions are discretionary and final.

source: https://bt.irlbtc.com/view/757624.msg9286543#msg9286543

congratulations to the lotto winner.

Win bitcoins only for chatting must made everyone's days better

0.6BTC.