Yew longbows have been 700gp+ each ever since the Grand Exchange came out, and yew longbows were an item that was very high in demand before the update. Jagex made yew longs incredibly overpriced for some reason, and I don't think it's because they think they were undervalued. The same with steel plates, 500gp+ over priced now. Jagex is nerfing alching for some reason. If Jagex won't fix yew long and steel plate prices, I don't see any reason why they would fix the gold bar price. Like I said, they won't change because of price floors. For most commonly alched items, the price floor is 11/12ths of the alch price.