like the idea

It's a good idea on paper, but with the healing drone and repair kits getting 6% is too easy. Also campaign missions are infinite, this can be just as easily abused as trading.

By making the %s low you're essentially drawing out the time it takes for people to farm the items that they would've normally payed for. All this is doing is moving the problem.

You are discouraging exploits by making the chances slim, but anyone determined enough could easily get a free gold box in one afternoon, all by smashing the easy missions, and letting their health regenerate vs the last buggy. Do that process twice a week (Saturday and Sunday, when most people have free time) for 52 weeks, and that 104 gold boxes worth of tokens Tacticsoft just gave away. For free

Maybe have it so these chances only occur in missions bought with keys, but still that's a lot of missions.

This isn't about me wanting this to be balanced. This is about Tacticsoft losing money when people realize they can use their time to gain gold boxes instead of tokens.

You need to understand that the implementation of this will just push potential customers away.

"Why would I ever spend money when I can grind gold boxes in campaign for free?"

I say, make the chances 1% when someone beats a mission with more than 500 health left.