They will pay a fortune for a common stamp just because it is more perfect, and purists make the market. Now that I am done talking about how the PO ruins the value of stamps, I will discuss how you and I do the same. Stock pages have bent many perforations and corners, ruining the value of the stamp. Wet tongues, overdoing the hinge licking, stick stamps to pages. Again, the value of the stamp is reduced drastically.
Stamps are easy to tear when separating from the sheet.
They crease and tear when used on a letter when not properly stuck down. Stamps that are stored in moist areas get fungus spots, turn brown, turn brittle and again become close to worthless. Store your stamps properly and handle them with care. Stamps whose appearance has been changed should be avoided. The top of the stamp can be damaged as easily as the back.