Is this roll from today? May I ask why base reward was 18 satoshis? It's around 56-60 satoshis here.

GT is obviously biggest event and biggest reward given by freebitcoin. I really think that it’s gamble of “the richest”.
Indeed it is for the whales, because big gamblers are going to own most golden tickets on the competition, with 1 GT being rewarded every 500,000 satoshis wagered on multiplier or events. The guys on top 10 daily wagered amount are going to have tons of GTs, against average users who have a dozen of tickets on best hypothesis.
In my opinion it's preferable to wager 500,000 satoshis to receive 1 GT than purchasing each of them for 25,000 satoshis, though.