The First Edition cards are more expensive because there are fewer of them. They only make one First Edition release and after that it's all unlimited. Fewer copies of something makes it more rare and hence, more valuable.
Solution
First Edition are somewhat more expensive because you get a little extra writing on the cards. Even from the original country Japan, they don't use 1st Edition cards because theirs no such thing. Either that or the cards I got were just Unlimited Edition Japanese cards anyway.
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Limited Edition means that there was only a certain amount of that particular card made. First edition means that the card is from the first printing, making it more valuable that a second edition (which is basically the later mass production of that specific card). Limited edition cards that are also first edition are the most valuable, then comes regular limited edition, followed by first edition.
The 1st edition has a small 1st edition stamp under the left corner of the charachter picture.
The only way to know if a card is First Edition or Unlimited is by looking to the left of the Pokemon information right below the picture (See image below). If it has the label "1 Edition", then it is a First Edition card. If there is nothing there, then it is Unlimited.
The first batch of cards they print have 1st Edition written on them. Any later ones will not have it, these are referred to as 'unlimited'. Some people prefer 1st edition, but it doesn't really affect the value.
The 151 original Pokemon cards are so expensive as they were the first edition and many are hard to find.
In the series Yugioh, Yugi is 16 years old. In the series Yugioh GX, he is 26 years old because in Yugioh GX, Domino City is 10 years into the furture in Yugioh.
time has passed since the first yugioh series. for example:yugioh GX was made 10 yrs after the first one and yugioh 5d's...well i dunno how long it was after GX