If your question is only if its profitable, i can answer that YES!!!
but you can be sure that you will profit big amount. as theres a lot
of dice sites already running. unless your dice site will be very unique,
that other will be attracted to it and if you manage to promote it successfully.
naturally the first days of the site will be so hard.and you really need people to help you out.
and also they are right the wagering amount doesnt matter at all.
For me. it is better that you make a game-base,like clash of clans btc involve and gambling
and looting in war. in that case.. much more people will be interested. hehe... goodluck.