Does anyone have any experience with how adding shipping rates to your Product Search feed affects rankings? Our feed is pretty well optimized from a keyword and product ratings perspective but we do not include shipping in the feed. Our products are large and heavy so we can't offer a flat rate but have to determine shipping dynamically based on weight and delivery location. I can see that some similar feeds that outrank us do include shipping.
If shipping is included in the feed, how is it enforced or even advertised? I can find nowhere on the Product Search site where the shipping cost or weight can be found for a product.
Thanks in advance to anyone who can shed any light on this.