Something is worth somehting to someone. The market may dictate a card is worth x,y, and z. but I do not want to pay that. Hence the market can suck it and I will wait for it to come down. I think wax junk cards are worth a penny unless a star or semi-star as stated in the previous comments. However, I would rather pay $0.18 than $0.99 if I need the card. If I do not need the card that bad then I will wait until either I can trade for it or I can get it for a cheaper price. When building sets it is easy to pass until the end. At the end of the day if you need a card you have to be willing to pay a premium.
When life has you down buy a pack of cards and realize you overpaid.