In order that you ask:
Nope - she's sick, and was medically certified as so. The bonfire night was three days before the show - she became ill in the interim
Yes, but not for the reason you're getting at - Laura (voted off last week) is a real talent, unlike one or two others on there. As your story points out, tens of thousands of people agree - and there's at best a question mark over the voting with many claiming they were unable to vote.
Nope. But money talks and if you can afford the best that's what you can pay for.
Yes, an NHS doc would've been good enough, but why have a burger when you can have steak?
Lastly - the voting public paid, through paying silly money to vote so that Simon can find a few new acts to exploit.