I don't know if this helps any, but if I'm interpreting this correctly wagering credits on WGT would be a misdemeanor for both parties.
Even if this isn't the exact reason, it's probably something very similar and related to skill-based gaming. I'm pretty confident WGT doesn't intend to purposely exclude anyone, though I can offer no explanation as to why it was ok for everyone to participate in this tournament 6 months ago.
Anyway, I'm not the best with legalese, so here ya go...
http://www.gambling-law-us.com/State-Laws/Connecticut/
Sec. 53-278b. Gambling; professional gambling; penalties.
(a) Any person who engages in gambling, or solicits or induces another to engage in gambling, or is present when another person or persons are engaged in gambling, shall be guilty of a class B misdemeanor; provided natural persons shall be exempt from prosecution and punishment under this subsection for any game, wager or transaction which is incidental to a bona fide social relationship, is participated in by natural persons only and in which no person is participating, directly or indirectly, in professional gambling.
(b) Any person who engages in professional gambling shall be guilty of a class A misdemeanor
"Professional gambling " means accepting or offering to accept, for profit, money, credits, deposits or other things of value risked in gambling, or any claim thereon or interest therein.
What really flips my lid about this is that CT has a few casinos. I guess that's not skill-based gaming, but that doesn't really make sense either. Meh.