The main problem I see with the cast of Storage Wars demanding more money is they are expendable. Think of Survivor, there's a new cast every season. Storage wars isn't like the show "Friends" where the public builds up an affection for the stars and allows the stars to demand more money each year.
I disagree. I think that people do root for their favorites, follow them on twitter and facebook. There are so many ways to get involved with a reality TV show that takes it beyond the show. If you want to follow Jarrod and Brandi or Barry or Ricky and Bubba, etc. etc. etc. You can see what they're up to outside of the show because they all legitimately have businesses outside of the TV show.
So I would argue that people get even closer to the characters than a typical sitcom. With each departure of cast, I would think that the show loses a segment of their viewers after a couple of weeks. To use the original show as an example, Rene and Ivy are no replacement for Dave Hester. I would imagine that the ratings hit the show is seeing is based upon the fact, at least partly, that Dave isn't there. Once the public sees that Barry isn't coming back, that show might end up dying.
I think Texas has done the best job of replacing cast member(s). Moe's out, he was eccentric but boring. To me Ricky and Bubba hold the show together. Once they go, if they go, that show is done.
New York has the most solid cast.. I think that each buyer, or team of buyers, holds their own with the fans. It'll be interesting to see what happens when the cast starts changing there..