That's right- We have no evidence of anybody but a hippiemancer actually exchanging goods or services for Rand. It would certainly make sense for them to be useless to anyone else.
That changes the thinkamancers "No charge" from an altruistic or self-serving 'We will help' or 'We want all the credit' to a more snarky 'Don't bother paying us what you offered.'
Perhaps Rand are used for the purchase of Mawijuana?