I've been doing some research and some of the states on the list you provide as prohibited are actually gambling states.
Prohibited States & Countries
Residents of the following states and countries may not participate in Skill Gaming in Second Life:
Arizona
Arkansas
Delaware
Florida
Kentucky
Louisiana
Maryland
South Carolina
South Dakota
Tennessee
Here is a link to USA legal online gaming states: Legal Online Gambling by State
http://www.legalgambling.net/legal-online-gambling-by-state.html
I hope this help because seems a little confusing that gamers on legal states can't play.