as far as I see very profitable, because I always look at the statistics homeowners dice sites is growing every day
Don't believe everything you see in statistics, their profitability depends on the amount of gamblers they get and how much those gamblers play and that is the most difficult part, even older/trusted sites like Primedice has to do promotions from time to time to attract them, then there is the trust part, the trusted the site is the more whales it is going to get, which is not the case with the newer ones. Other than that there are problems like getting hacked, bugs and you have to maintain a huge bankroll for if someone gets really lucky you'd have to pay them.
So let's just say no, it is not easy to run dice or any other gambling site, at-least not at start, for first few months you'll have to run a lot of promotions/advertisements just to make people aware that you have a site and its expensive.