DY,
From what I understand from the Rama, there is a Machloket on doing business with stam yayin Lichatchila. PBA’s situation is a bedeiavad to begin with – some one gave it to him.
Besides which, my understanding of doing business (“assur liknoto uliMacharato kidai lehistaccer” in the Rama) means as an ongoing inventory item (not a one time deal), and that includes monetary gain (hence the lashon of sachar – not including good will). Neither of which are in this case.