When the world record potato yields are produced by poor Indian farmers using entirely natural, labour heavy but chemical free mnethods, I suspect we are being told a few porkies about the yeild efficiency of GM foods while good cultivation practices are downplayed because labour cannot be reproduced with a bit of gene-splicing. In other words, it's about the money as usual.
No GM for me, while I will be studying the Bihar methodology of intensive cultivation, weed removal and phased irrigation, not to mention the effects of quick earthing while the stems are still essentially in root mode rather than being sun-ripened into an internal change into stem growth (several days after emergence from soil level).