But Woodstock, or any other tickets are a limited resource by definition, the venue can cope with X amount of people there, where X is at max some area dependen

But Woodstock, or any other tickets are a limited resource by definition, the venue can cope with X amount of people there, where X is at max some area dependent value and can be limited further by safety measurements and/or law. So your "proper market" criteria doesn't really exist for anything but digital or virtual goods.