I onced remarked to my dad how expensive plumbers are or anyone else who is self employed, and he replied, "They have to eat too you know", That gunstore through the selling of guns has to put food on the table, pay the electric bills, the insurance and the like. They have to make something on those guns or else why bother. Greg, just blow it off and go back they appreciate your business and probably the reason they went back and forth for an hour is they probably didn't want to offend you.
All the best