I saw that there are so many bitcoin dice gambling sites and new ones starting each day.
So my question is if owning such site is profitable?
How much starting capital would be needed to start dice gambling site?
Of coarse it is profitable or they wouldn't run them. You don't need much capital if you use investors. But you need a proper game plan. A marketing plan a layout and design for the website then the actual programming and probably fair. It's a lot of work but you can do it.
If you don't use investors you can probably start with half a bitcoin. Just make sure you set a limit. You can increase it when you aquire a higher bankroll. Good luck.
There are many reputable dice game exist and so if you want to build one make it competent so it would be also one of the playground of gamblers.