if anyone is interested in going to ta gaming lounge its the mainstream and not PC gamers, you will save on not having to buy 4k TV's as the consoles cant do better than 1080p anyways 720p for the last gen consoles. I would serve bottomless non-alcho drinks myself to get people in the door if you want to charge an hourly rate.
OFC you need to serve alchohol aswell maybe with discounts with your membership cards.
Im just afraid that the demand for a "PC" gaming lounge is going to be so low. Maybe start with 1080p ultra setting rigs and see if the PC community where you live is interested b4 yuou invest in 4k machines that cost about $4k themseves.