Most valuable toy: Nintendo World Championships, NES ($100,000)
Original price: $50-$100 
Selling for now: All over the map

Video games generally don't appreciate in value. The most beloved games particularly don't gain economic steam because everyone still has a copy of Super Mario Bros. in their attic. Terrible video games stand a much better chance of becoming collectors items, but only if they are so bad that people went out of their way to get rid of them or if stores were forced to ditch their inventory due to complete lack of interest. Atari's infamous E.T. game made headlines after a batch of cartridges were found in a landfill and fetched top dollar on eBay.

Action 52, released in 1991, met a similar fate. The universally reviled Nintendo game, which was really 52 shoddy mini-games for the price of one terrible game, has sold for as much as $500 over the years. How bad was this game? Hardcore Gaming 101 had this to say: "Action 52 is nothing short of a complete disaster, and regularly ranks as one of the the worst games ever made, and it's not like there's a shortage of reasons why either. Shoddy mechanics, problematic gameplay, poor hit detection, and... well... in a nutshell, everything that makes a cheap game look and feel cheap is present in these games."

Other poorly received games that have risen in value include Secret of Evermore (SNES), Shining Force III (Sega Saturn), and The Flintstones: Surprise at Dinosaur Peak (NES). Unless you have a collector's edition game like Nintendo World Championships (NES, only available to contestants in the Nintendo World Championships) or Uncharted III: Fortune Hunter Edition (PS3, only 200 ever made), the more terrible the game, the better its resale value.