And there you have it folks.
I usually get a new bow every two to five years depending on what is out there and if it will give me something different or possibly better than what I have. Sometimes people purchase a bow that they think they really like and after shooting it for a while decide it isn't really what they wanted and sell and buy a new bow.
Some people shoot tournaments and get shooter discounts so that the companies can showcase their newest bows on the tournament trail.
Many many different reasons.