If I had to venture a guess, I'd say wooden spoons are favored because of their versatility. They go from cast-iron to non-stick to stainless pans without fear of scratching. They won't change the taste of acidic foods like tomato sauce the way metal utensils are purported to. You can leave them in the pot and they won't melt or get too hot to handle. They're incredibly durable and, well, they just feel good in the hand.