Race The Clock - Highest Balance Wins
My Suggestion is a specific game is picked for all participants, everyone starts on the same balance with a time limit of let's say 20-30 minutes or maybe a little longer, perhaps this can be 'bonus money' or real money, maybe £100/€100 start. So once the timer ends, the player left with the highest balance wins, and of course there can be prizes for 2nd and 3rd maybe. So the catch to this race is that you have no idea what everyone else is on, so you could get a big win and stick to your balance, and choose not to play anymore spins and let the timer run out, but the risk is not knowing what position you are in. The other alternative could be to have a leaderboard showing your current position, but i prefer the 1st option. Another option could also be to have a minimum amount of spins you have to play to make it more interesting, and the stakes have to be the same for everyone, so perhaps a £1/€1 fixed stake per spin.