How much can I sell these Yu-Gi-Oh cards for?

you will never get what you think the cards are worth. yes, sometimes on ebay the bidding gets high, but thats for cards like DAD or Solemn Judgment. you will be better off just keeping them in a safe place for 20-30 years til they are really worth something. I am not putting Yugioh down, I collect also, but thats how it goes