Golden Leaf in downtown St Paul has a similar policy and needless to say the place is constantly empty. The owner is a real peach too...

There are a handful of B&Ms around the cities that I frequent regularly that never have an issue if I just stroll in and light up. Ive bought a ton from them over the years, shoot the shit with 'em on the regular and have even helped them set up for events and such. We have a solid relationship. Ive traded and exchanged freebies with them much like I do here and elsewhere online. They know I like to rest my smokes for a bit so they dont enforce a "buy it now, smoke it now" policy on me, those types of places are definitely in the minority and I try to avoid them. Of course if Im going someplace for the first time I will buy it there and smoke it there, pay to play, and first impression is everything.