Promotional costs will be so large that they can affect profits and possibly suffer losses for a certain period of time, even though your product will get high reviews and a good rating, but is it possible to cover the losses that have occurred by increasing prices little by little.For beginners, they have to play with attractive prices and promotions to attract buyers. After getting a lot of sales and getting good ratings and reviews, then I increase the price little by little to get a decent profit. I get new customers from ratings and reviews of existing stores.