Which data do you talk about? And website has multiplier that gives you possibility to get maximum 4,750 times profit on your bet. One can be lucky and successfully roll bet with eleven odd. There is a 8.64% winning chance on bet with 11 odds on freebitco dice. Yesterday I rolled 0.00000512 BTC with 0.00066119 profit, so? I guess there are rollers on freebitco that bet and wager way higher than me because I didn't manage to win the wagering contest.

Definitely house edge is the same, they can't increase it for particular users. So, house edge stays the same but instead they ask you to wager it for many times, that's where usually casinos hope that you'll fail.