They are like golf clubs. New models come out every year and some people have to have the newest. They think it will make them better at the sport. Then they sell last years model or set at a loss.
When I was a kid selling bows at a sporting goods store a mechanical trigger release wasn't even lawful for hunting or fiberoptic sights in Pa.
Back to one of your questions, google the pros and cons on the difference between a single and double cam. That can help you decide what you are looking for.
Was looking for some Muskie lures a couple weeks ago at my sons place up north and came across over 60 new trail cams and some large totes of archery hunting razor tips Rage ect. all new in the packages looked very nice selection. Told him to sell the trail cams for Christmas. He said he is not allowed to sell the hunting tips doing his tackle shows. All those totes will be taking up room for the next 20 years.
Nice deer guys.