It's not a qustion regarding Rollin or other gambling/dice sites.....i've played (and sometime i still do) for more than a year, and i can confirm that it depends only from luck...good days and you will fly, bad days an you will go bust also with 80% chance win....of course if you have a money management system you will stick your wins for longer, insteda if you go all-in like Robertt made, you will go bankrupt very fast....
Don't touch illegal quetion about exploit for the site, if you want to gamble legally, to win you need only lots of luck