"The failure to make a public statement to that effect will, even to people who believe that it is inconceivable that Team NZ would do so, look rather like corporate blackmail aimed at the Government: 'Pay us a hosting fee or we will go elsewhere'.
Farmer said it was "inconceivable" that board members such as Sir Stephen Tindall and Bob Field, who have supported Team NZ for many years would be parties to seeing the Cup disappear from New Zealand shores for the sake of a hosting fee.
"Nor do I believe that men who have made their justified reputations on corporate integrity would negotiate with the Government and/or the Council for the allocation of public funds in such a crude fashion.
Farmer cast doubt on whether it was even legal for Team NZ to take the event to Abu Dhabi or Russia given the contractual arrangements already in place with challenger of record Luna Rossa.
The Auckland QC also questioned the cost of the new foiling monohull class proposed by Team NZ, echoing the concerns of America's Cup legend Dennis Conner.
"No one has ever built a 75-foot fully foiling monohull and the sketches that have been released of the proposed boat show what a breath-taking challenge it will be to design and build such a boat and to make it sail," Farmer wrote.
"The technological complexity (and associated costs) of the AC multihulls must surely look simple and modest compared with what is now proposed."
Farmer stood down from the board of Team NZ just a month out from the start of the 34th America's Cup to be involved with an international committee to investigate the safety rules following the death of Artemis sailor Andrew Simpson in a catastrophic training accident in May 2013.