They won't have been made in haste necessarily, but workers were paid on piece rates and quality standards (i.e., what was deemed suitable or unsuitable for sale) weren't as high as they were now. In addition, items that were as much decorative as functional were a new thing for the working classes. They wanted things that they could afford and top quality takes time and costs money. It's like today, you don't go to Poundstretcher and expect Harrods quality. You want something pretty that you can afford.