Tomos, have you thought about using
Offerwalls?
For example this site :
http://bitgames.io/using 12 of them and it benefits the site owner and the players.
Easily I am making more then 50000 a day there. Hope soon to make the same here.
And this one here :
https://www.coinbrawl.comgives the players 1 mil satoshi every day for the last year .And he has only 2 banners on the page and only 70 active players.
He is using Google ads. I know it is difficult to get them. But Offerwals I think are good option.
the problem with offerwalls is, i must wait 3-4 months for payout from them (if they are not scammers) , and this time i must fund players from my own pocket again