Thing is, a Vineyard isn't just (or even MOSTLY) about getting Wealth/Art. They are more about establishing greater market share in a trade good. Same as Expand Snail Cultivation and Plant Poppies.
Sure, but we aren't going to get much more out of it other than an innovation roll. On the other hand, being able to grow poppy seed and let us dominate which brings in additional wealth drip and help us deal with the taxation crisis.