I actually thought it'd be pretty cool if items like Turnip prices, bug prices, fish prices, etc.. were all affected by how many people were selling them. For example, you might wake up to Retail buying turnips at 512. So, you sell off all of yours. Then, you start inviting people in. As more people sell, Retail starts offering less and less. Same with any particular creature. Start farming beetles at night? Eventually, they'll be worthless. Meanwhile, those SeaBass that you're always throwing back.. suddenly, there's a demand for them.