Interesting. Mark was supposedly on a flight to LA on 17/10/18 to "make the deal". He even messaged me a copy of his(?) ticket. I think maybe it was screenshots of the booking website. Den -> LA 17/10, LA -> Den 21/10. So someone was tripping, or pretending to.
Haven't heard from him since, despite my asking. If he can afford flights to LA and back, where is my refund? Where is anyone's refund?