Crashing 07 price hasn't been great for us. Our stock started losing value by the day and we had to dump it. Also there is a lag before sites realize and start lowering buy prices and customers get used to the new price. If they we're selling to us for 1.6 a week ago when you offer them 1.2 they're not going to be happy about it. (Just examples) Also it doesn't necessarily translate to more $ in sales. Customers often just buy gold by how much they have. If they have $25 they'll buy $25 worth of gold regardless of the price. If they need a specific amount in mills, well that just means they're paying a lower price than before so that doesn't translate to more in sales either.
Don't think it does any favors for the customer either. Any gold they already bought/earned has lost value. Any any benefit from the cheaper price is eventually lost because of inflation (assuming the crash is from dupes). Although I suppose if you didn't have any gold and went to buy some immediately after the price drop it might be nice.