Yeah, here they sell "edible dahlia tubers" that are supposed to be better than the ornamental variety but they are apparently still not that good. :P

Food fashion is a funny thing, and I spent quite a bit of money in the past trying out "exotic" things that a) just aren't that good, b) don't grow as well as they are purported to, c) take too much effort to grow/harvest/cook. I think it is good to diversify one's food sources but sticking to mostly tried and true staples is not pretty smart, too. :D