There are no other way on how to monetize your site and its really impossible to think of that a gambling site owner wouldn't think
on how he would profit and charitable works is quite not common nowadays even millionaires do create their own business online
to gain up something out of their funds and doesn't tend to give out free service to the community.We know that staffs and maintenances
do have some cost and running a site will really have some those expense and making no profit wont be sustainable.
they can run ads on thier site just like what other websites do , so that they can keep the site up and pay other maintenance cost . you mention charity ? i see some gambling sites are now giving some of their income on the charity that they choose based on thier poll . the title really says it all . this gambling site is really unique to have a zero house edge if ever the owner pushes it . this can get instant attention resulting for them to become indemand which can make thier site run longer than usual