I have been offered a 'buy back deal' by a publisher for a non fiction cookery book- I have to buy 2000 books at a 50% discount and they will pay for all origination and production costs, photographer, designer, copy editor, printing. I get an advance on royalties in 4 instalments of 10K. I believe that for the price point suggested for the book I will pay up front 26K which with the full advance would mean I had paid 16K to get the book published. Is this a bad idea? Am I better going down the route of assisted self publishing and how can I be sure to get a reputable organisation?