WHO GIVES A SHIT: DO YOU GO TO BUSINESSES LOCATED ON THE SECOND FLOOR?

I guess this is mostly a phenomenon on 7th Ave, but I'm wondering if you ppl actually patronize Park Slope businesses located on the second floor? 

I haul my ass up the stairs for my manis at Lin & Li nails and don't even think twice about it. But there are actually quite a few businesses around here that are located on floor dos. When businesses located on the first floor can barely stay in biz, it's curious to me that these 2nd floor operations are still alive and kicking. Is the rent really *that* much cheaper? Will it only work if you are a "service" business? 

What say you guys?

*As some VERY helpful commenters have pointed out, Perfect Brows is not closed (as we previously stated). They're alive and well and located up the street at 139 7th Avenue.