Is it true to save money? Is it worth paying 15 yuan for free shipping?

Same as the Knight Card, you pay IQ tax. It's very simple. As long as you are willing to spend 15 yuan for postage, you can apply for these cards as long as you want. So why do they bombard you with text messages and various advertising promotions? Every time you click on the page, they tell you how many are left or how many are left. There will be no limited time offer for a few hours, but it will still be the same next time you order, as if you are always one of their lucky ones. Those who play these tricks are all scammers, that is, bad businessmen. Who among the merchants with real quality and guaranteed quality will engage in a one-shot deal with you and play this kind of trick of killing customers right now