Doesn't the LHBS have to pay rent for a retail space? And employee's to run the store at convenient hours to meet customer needs.
If you are a volume purchaser you should talk to the owner about a discount so you can purchase what you need locally. They most likely would rather have a small profit than none at all.
If they give you rude, crappy indifferent service than that is another story.
I have four sources within 30 minutes of me. One has crappy selection and service, another has a decent selection, high prices and sometimes good service, another has almost everything, a range of good to bad prices and the final one has a good selection, outrageously good service - will accommodate you almost 24/7 (seems like) and the best prices of all. They even deliver if you order enough. Wonder who I use most?