Number one problem is people spilling stuff on the gaming gear and such,especially none-gamers.
You would need to seal a area where all the gaming gear is going to be where you have a good overview of it's entrance and whats going on inside from the counter.
Maybe also install a portable sink near the entrance with an automatic soap dispenser,dryer and pedal water controller (they cost a bit though and they can fall over if not properly bolted down.The 2x10L water bottles also need to be replaced often if you are busy or using one as an outlet)
