You appear to be selling for <1/3 what you will be paying UA to do the transfer.
"There is a cost of US $0.015 per mile and the processing fee per transaction is $30."
To address and resolve that issue, I very rarely transfer, in fact I almost always decline transfer requests. Processing and transfer fees only apply if miles are moved from one account to another. There is no fee if or when tickets are booked directly on my account.
http://imgur.com/a/sX0sTThere is also the issue of seat availability so for those interested I must first check your itinerary and contemplated travel dates against the airline's capacity controls.