I had an ad on Gumtree for some Lounge Passes and Qantas used my mobile number to discover my QFF account details and then send me a warning email.
The email explains that according to the Frequent Flyer T&C offering passes for sale constitutes as abuse or misuse of benefits and could result in suspension or termination of the QFF Membership.
Good.
Always thought it was stupid to be able to sell those visitor passes like that. The sale prices being around $50 was equally insane that people would pay that amount for 1 visit to the Qantas club - totally blows my mind why somebody would pay that sort of coin for a single pass.