开个7-Eleven便利店会赚钱吗？

We have been doing online business with success for a couple of years. Now, we want to add a new sales channel and open a brick-and-mortar store. Somebody suggests to open a 7-Eleven convenience store. We have enough fund and should have no problem to get the franchise. But we have no experience to operate a grocery store like that, so we don't know if it will make the money or not. Will anybody who has experience shed your light?