Suggestion for next update
If you upgrade a player, you should be able to sell them as they most likely wont be in your lineup forever. A lot of people did not know this at first and were displeased to find out there upgraded players were non-auction-able. Hopefully this can change in the next update so you are able to auction players even after you upgrade them. Thanks, and overall great game so far.
Trickypickle about
NBA LIVE Mobile Basketball, v2.1.4