hi maybe because it takes approximately 5 minutes to do the same … so why would people spend money for such an item when they can redo this quickly?!
designers should get it … if they do not want graphic designers to disappear one day they should forget about those minimalistic things … otherwise we will all be replaced by stupid automated services or applications where customers create their flat thing on their own …
in addition your typo is very flat, nothing is outstanding (especially the main element “sale” > too flat) and the hierarchy is suffering from it …