Give you my little issues about things like that.

Always when I go to a place that provides gaming and internet , the internet is also slow and unplayable, so your playing only with people inside the store, so your locked down to what the collective feel like playing. The gaming rigs were low end hardware.

So in all honestly don't even think about PC's , too much work to maintain and people don't exactly like moving their pc's around unless it stays somewhere for the weekend.

Would be cool to have comps, such as Guitar hero weekend battle, Rocksmith weekend, etc..

"thinking of opening a video game bar and loungue "
Would be cool in the sense of when there is tournaments, people can watch the game drink and talk. Dota 2 internationals.

When I was younger, they used to have a Lan house up the road where you booked for either the night or the weekend and you competed against other players in Counter Strike, winner took all, unfortunately that faded so I was never able to give it a try, but it most certainly had my interests.

What are you going to do about hygiene, especially concerning controllers?
Oh and BTW, there is a hell of a good reason why Lan's don't always say, bring booze or drink while you play.