If you are a SC resident you pay a sales tax, if you are an out of state resident you may be subject to a use tax. I think the states listed do not charge a "sales" tax on vehicles or don't offer some type of credit for taxes paid, therefore, that is the reason they are treated differently.
This link may be useful:
http://www.sctax.org/Tax+Policy/Info...r/il93-26.html
Doesn't seem like SC pursues this use tax on vehicles delivered at the Performance Center.