Firstly, none of these Ebay auctions are "rip-offs" - you can see exactly what you're getting. In the case of that bloodbowl team, they were listed at 99p. Obviously, three bidders really wanted them.
However, this one is very misleading:
$55 plus $15 shipping would be expensive for the Space Hulk Campaigns book. However, you're not getting the book; you're only getting the counter sheet and one of the two board sections!