Can a web site cancel your reduced subscriber fee then ask you to rejoin at a higher cost

You have to read the fine print of the contract you're signing when you pay. If it says they can do this, they can. If it doesn't, they can't, but...

Can I get in legal trouble from online sports betting?

Your research is wrong. Online gambling in 99.9999% of all circumstances is illegal federally.

Can I use a vuvuzuela at a highschool football game?

1) Vuvuzelas are hilarious because they are so annoying. But if the school wants to ban them, they can do that. 2) You clearly have no idea how...

Is it legal to bet and make wagers on horse racing online in Illinois?

Surprisingly, yes it is legal, as linked above.

Is it tax evasion: probably. Can it be reported: it absolutely should. Can you get a reward: possibly but I wouldn't bet on it.

This is too big of a deal to not see a lawyer about. You should do so immediately.

Do I have a case if a co-worker used slander and libel against my character which is untrue?

You haven't provided enough information to make a determination whether this is actionable or not. Unless you suffered severe damages from this,...

Do I have a valid case for "defamation of character"?

I have to correct Mr. Kester -- accusations of sexual misconduct are in many states considered defamation per se, and damages are presumed. You...

Can I give out free copies of a copyrighted Facebook game on my forum or website without permission if I hack the game?

No, absolutely not. This is such blatant copyright infringement, I can't even imagine how it might seem OK to you.

I am a teen. If someone whereto post libel about me on a social networking site, what are my rights to do?

Your rights are basically whatever your school's cyberbullying policy says they are, unless you're looking for a legal remedy in which case I'd say...