Unbelievable !!! 31

I ordered the part for 10 Cent Shipping Included. How does it work? It came as promised well packaged in cushioning envelope to. It works well. I tested it on my living room cabinet. Pasted mat to the vertical wooden cabinet door and then an iPhone 3 (yes, that turn down with the round back. It was several minutes stuck until I've pulled off again. No residue on iPhone and wooden door. But it is unclear to me how to deal with 10 Cent including Returns still can earn money ...