Maybe they did some gene splicing and came up with a potato that has interesting qualities when the vines are dried and smoked...That would increase the demand for the tops, and the spuds themselves may be an unnecessary byproduct.
Its because of potato fest guys, you know them drunken fest people eat like mad... Man, they are out of potato cakes! Time to switch to rice cakes I guess... Soybean Fest anyone!? In case potato fest is busted. lol May be peanuts fest is better... unless your allergic. I think good ol' Charley brown and Snoopy-dog would agree! lol