I was just going back through and reading some of your previous posts and came across this one.

The thing that always kills me when I see people calculating ROI is saying "I got vouchers for free, so they cost $0". No! You could sell them for the market rate, so using them for packs is not "free", it has a cost. I need to figure out a way to explain this without telling people "you're dumb and I'm right" haha