If I were asked to pay a $30 "explanation fee" I would want to be absolutely certain that the person giving advice is knowledgeable, experienced in photography, 100% correct, and not giving biased comment based on the amount of mark-up the store expects and/or commission the salesperson expects to receive on each brand. I am not at all confident that I could find such a person behind the counter of even the dedicated camera shops, e.g. Teds, so the chance of finding such a person in the likes of JB Hi-Fi is about as good as finding a snow flake in Hell.