Applicable to: 2-Star Champions. In the 2-Star Arena, your points are based on the Champion's PI (Power Index). Sometimes, veterans will sell a maxed-out 2-Star and re-rank a new one. Why? Because the first 10 levels of ranking cost almost zero gold/ISO, but give you massive PI gains. This allows you to grind Arena milestones faster. Warning: Only do this if you have a deep 2-Star roster to spare.
Instead of selling, the game encourages you to "sell" them back into the system by pulling them again from crystals. When you pull a duplicate: how to sell champions on marvel contest of champions
If an account was compromised, hackers would often sell a player's entire roster; removing the feature protects your hard work. Applicable to: 2-Star Champions
To fix this, Kabam released Update 26.0. They removed the "Sell" button entirely. Warning: Only do this if you have a
Despite the massive warning above, there are where selling is strategically viable. If you are below Level 40, ignore this section entirely.
Kabam, the game's developer, disabled the selling option for several strategic reasons: