Yes my local dive shops do testing and service at a premium and they also sale new gear at 3 to 5 times more than what the big name dive shops sale for on the internet. I guess this is why they drive exotic cars and live in million dollar homes. I purchased enough equipment from EBay for three divers for what my local shop wanted just for the one regulator set, and yes it was taken in and tested and serviced before use , the shop had all the parts because it was the exact same unit they were going to give me such a great deal on! One set was from a person who purchased all their equipment and then could not complete their dive certification due to a sudden medical conditions that came up, and yes this individual should have an outlet to sale their equipment and yes the dive shop still gets paid for service, so I fell there is a market for EBay, and yes there are crooks that will try to sale junk and steal your money on EBay.