If you sell an unused cover you get Iso 8. If you upgrade your token with more than one cover and you sell it, you’re put in a disadvantage.
For example:
You get the first Cover of Black Widow (Modern). Now you could sell it for an amount of 100 Iso 8. If you get a second Cover and you use it, you could upgrade Black Widow’s abilities. Now she had Aggressive Recon Level 1 and Widow’s Sting Level 1.
If you sell Black Widow now you will also get 100 Iso 8 instead of 200 Iso 8 (for 2 Cover).
If you level up Black Widow (not her abilities) you will get more Iso 8, but not nearly the amount, you spend.
That’s not fair!
I think, you should get at least the amount, you will get for the single Cover. If Black Widow’s Aggressive Recon and Widow’s Sting are both on Level 5 you should get at least 1000 Iso 8 (the amount of 10 Cover).