User blog comment:Majesty1/Trading Units Campaign/@comment-202.65.121.138-20150903080624/@comment-26583396-20150903082227

This,trading would lead to abuse of the system.The game is a lot more generous than most with its giveaways anyway,even pure f2p can save gems and get together a good enough squad to clear most of the content,friend units can help a lot as well.