I do keep the markup at 25%. I have a mix of cheap and more expensive items for sale, but they tend to shop the more expensive items more. I think the most I've had 9 sales in one day, but it was mostly stuff that sold in 300$ or more and almost none under 100$. The shops are well stocked so I don't really need to restock during open hours. Sims come in large number into the shop but they tend to just congregate and chat around in the shop instead of browsing and actually shopping. In a bookshop some neat sims decided to put away in a bookcase the books I had displayed for sale. Had to ask them to leave the lot to stop messing with my displays. Regarding the employees, I usually ask them to answer customer questions so they mix around and talk with the customers. Whether they talk about the merchandise or the weather is anyone's guess. Manufacturing is tiresome because stuff tends to go off, flowers wilt and edibles spoil, and in my experience at least, sims prefer to buy 900$ books and 400$ catalogue flowers insterad of icecream or cookies or flower arrangements, and then you just throw them away. I was thinking of forming a club of like minded sims to create the icecream, cookies, flower arrangements necessary for the shop because crafting takes a lot of time, would have been nice to have an employee do that task too.