In my area (albany,ny) most people are ok with buying jags, jds, midevils and your very common stuff and paying way too much for it. A lot don't wanna or know about the online fish option. I used to trade with the lfs a lot but stopped because they had no clue of some of the fish I had and low balled me.
For example
I walked into said store(no name so I don't hurt them in any way) and said I was looking to trade a few fish. They said we don't trade unless its rare or worth it to sell in their store. I had a large redhead cichlid(11 inches), my female grammodes cichlid(wasn't gonna trade, they just wanted to know what I had), a 8 inch pure red devil.
Their response
We will take the redhead and give you $20 trade since we haven't seen one in years.( I didn't care as I got it for free, but not sure how they went years without seeing one and he said it was rare. Told me the grammodes was an african cichlid he had never seen before. I told him no its not african. He then said well it looks like a type of texas cichlid and they had one so didn't want it.(I laughed). Said the red devil was very common and he had 2 already.(they were midevils) said if I wanted to get rid of the devil and grammodes he would take them for free and see if they would sell.( I said no thanks)
This store had no knowledge of dovii, umbee, how to tell a true red terror from a mayan,and didn't know about the online buying or higher quality fish. I told them I hadn't bought a fish from a store in a few years unless it was used as a dither.
I would much rather spend $20 on shipping from rapps then drive the 20 mins to the mom and pop stores. Like right now I really want a high quality umbee. Rapps has 5 incher for $25 and $20 next day shipping. What a deal!!! I'm hooked to online buying for fish and supplies.
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One has to realize that in most LFS big fish don't sell every day. Some large fish remain in stores for months. Those fish have to eat, and they usually tie up a tank until sold. LOL! When bringing a large fish to a store for a trade, don't expect to get much for it.
As far as knowing about all the different types of fish, i will bet you that I can name lots of fish that you have never heard of. Not all shops are familiar with every fish and how to tell them apart.
Try buying a fish from the west coast and see how much you will pay for overnight shipping. Try buying a $2.00 part you need to repair your equipment and see how much it costs with shipping. Online buying is not always the cheapest.
Mom and pop stores are the dinosaurs of the fish hobby. It won't be long until they are extinct.