I’ve got 62 health packs I don’t want.
I’d sell 'em at 20iso a go if you’ll buy them back.
However, seriously, if you build the feature in make it 50iso so a 5 pack of healthpacks drawn from DDQ is equal in value to an unwanted 2*.
You don’t really even need to stop people from selling their ‘free’ first 10 health packs because they’ve got to log in to sell them and the iso flow is so poor as it is that logging in a couple of times a day to sell regenerating healthpacks won’t make a serious impact on iso flow.