A decent scale is less than $20 and a good scale is less than $30.
It's not even just for baking. How many times have you hated measuring out sour cream, honey, peanut butter, tomato paste, shortening, butter, etc. Well once you figure out the density of these ingredients (available on USDA website) no longer you will have to get a measuring cup or measuring spoon dirty, or try to futilely pack down the ingredient into the corners so you don't get air pockets. All you have to do is scrape a little into your mixing bowl until you hit your magic number.
If I'm not baking, I'm not measuring or weighing You are absolutely right, though, a scale is a really useful kitchen tool for more than baking. I do own one. It's a cheapo, but it's accurate.