User blog comment:FairyRaven/Fairy Tail Chapter 329: Seven Dragons, Review and Commentary/@comment-5871436-20130501012442/@comment-1776824-20130501192133

1 - Acnologia being strong doesn't make them "weak" (he was a Dragon Slayer who bathed in the blood of Dragons, remember?). It simply makes him "better".

2 - Really? Ivan said that at the end of the Fighting Festival arc, when Gajeel visited him. He said if he sold it, he'd get quite the pretty penny, thereby making it expensive. Also, rare. If it wasn't rare and expensive, wouldn't everyone be a Dragon Slayer? And implanting it doesn't automatically make you a pro, you obviously have to learn how to use it as well. Besides, it was that one Dragon. Aren't the other Dragon Slayers having a hard time as well? Also, spine-shot. There was nothing the Dragon could do to fight back. Not much a quadrupedal animal can do when something attacks it from above, really.