True, that keen business sense will tell them that there's evil afoot, and that during times like this a kid in green is sure to show up and pay TOP RUPEE for a glass bottle.
So they do ten minutes of footwork, gather cuccoos, and then get a bottle. They then sell that bottle for hideous inflation and split the profits. The 'Keen' aspect to their business sense just means the crit range on their Profession checks is doubled