A cousin was about to part with nearly £1400 for air tickets via this website. It claims to sell tickets based on redemptions of frequent flyer miles which people sell to it (actually it says travel agents, which seems quite odd as I'd assume travel agents wouldn't earn the miles!). The tickets were about 25% cheaper than any other online agent.
http://www.yourflightadvisor.com/
This seems very suspicious to me. I am concerned at best they would be breaching the conditions of the frequent flyer scheme and so the passenger would risk the airline not accepting the ticket. Also, they don't accept most credit cards, which seems odd; they were demanding money by bank transfer; and the website shows them as being owned by a London travel agency, but claims to be based in Copenhagen and Ireland. I can't find any evidence of the company that allegedly owns them.
Or perhaps it's a great business model offering great discounts and a chance to get rid of those 1000s of unused miles probably most of us accumulate. I don't know.
Has anyone heard of them?