Tipping Budtenders: What's the consensus?

To start, I always tip when I order online and they run it out to my car, that makes sense to me. But what about when you go into the store and knowing what youre gonna buy?

I believe that if the budtender offers great assistance in choosing the best weed for me obviously thats worth something but what about if I just show up knowing what I want?

I am apt to say if I am quick and easy I don't have to leave a tip, just like I don't the guy at the gas station or liquor store. What is everyones thoughts?