2. Sam Burgess | Rabbitohs to Bath
Perhaps the most controversial transfer in recent history simply because how mismanaged it looked and ugly it ended.
An early Rugby World Cup exit, disappointing Bath season later (Neither of which Burgess can realistically be accountable for) and a hostile press meant Sam returned to where he was fully appreciated, presumably, never to return.
What did it cost? £880,000 (But apparently the Rabbitohs helped with a refund)