you wouldnt
for example, i want a spartan carnage. my friend wants a nightfall. they're both maxed myth. we can trade! but they ahve to be the same tier, type, and level.
Trading within reason. the item must be the same level and tier as the one being traded, and must also be the same type of item(modules,weapons, drones, etc)
not to mention it would be 20,000 per item trade..
does that sound fair?