Unless it's nutrient deficiency, it's a goner... You could sell it for a lot, but you'd kinda be cheating people out of their money. However, try hanging on to it, as some all white plants turn green, or if you're really lucky, will get this gorgeous minty variegation... Grow it on, root some, sell for a ton... That would be best case scenario... Likely it'll die though... Unless it's actually yellow, then it could stay all variegated and have a shot.