Don't worry about being 'that guy' if they didn't want people to try their samples then shouldn't offer free samples. Most places have a bar, and if you tell em you just want to try some stuff, and you'll let them know when you find something, they'll usually leave you alone for a while and you can just sit there in front of a rack of atomizers and try flavours until your heart's content. Most places have high mark up on their juices, so they're making a killing and aren't worried about you sampling everything. Now if you do find something you like, it's probably best to buy it there, rather than go try to find it cheaper online.
As for juice, I judge by the quality of the juice, not by the bottle. But their are some higher end juices that come in fancy glass bottles, and there's definitely a markup for that aspect of it. (like buying liquor) But then you just have to decide if the quality of juice is worth the price. sometimes it is, sometimes it isn't. I vape Alice in Vapeland juice almost exclusively. they come glass bottles (and adorable shipping parcels) but their prices are pretty reasonable. I believe it's like $12 for a 15ml bottle. I could find juice for cheaper yes, but the quality of the juice makes me feel that $12 for 15ml is a bargain... especially since I know those glass bottles are more expensive.
