If it is to increase sales, I'm not sure how well it works. They get new players every year, which I'd think would drive sales enough on its own. Lots of people bought Ennis jerseys in 2014, which were outdated for 2015. People are going to want Prather and Jawai jerseys.
I can't imagine the Lakers or Celtics are hurting for jersey sales, and they've barely changed their jersey designs ever. And on top of that, the player whose jersey would be most popular in any given year is usually a fixture of the roster from one season to the next, unlike here where it's likely to be one-and-done imports.
Having a consistent design that becomes iconic and associated with the club will do more for sales than chopping and changing every year.