I talked to my local net cafe, and they said their load on average over 7 days its roughly 45%. He has 50 computers, so lets assume that 25 are always in use. $2 an hour, for 24 hours a day, 7 days a week, as his place always open. $8400 a day, not bad, and since he has family labor, no need for that. He also sells drinks and packaged snacks, he says thats a good $100 a day, so thats $700 a week. $9100 a week, roughly $36400 monthly.
So if all things remain constant, $436800 can be made, but .... this is next to a college campus.
Remember the stat.... many small business fail in the first year. If not the first, the 2nd year will kill roughly 89% of them. You are resonsible for all debts, or you and your partners.
Now looking at the other estimate, 250k could be very hard to make if your location stinks and you got city curfew laws.
Remember to also have a big screen tv, a few game systems, and a sofa. It will get boring playing nothing but CS.