Please! I think that there is a common misconception of the psul of gamblers eidus. It is not a psul haguf. It is certainly not k’ilu gezel. The reason clearly implied in the Gemorah is that they are untrustworthy since their testimony can be “bought”, I.E. they chazakah of lying for money. The rayah is that if the baalei din agree to accept the testimony of a gambler or a cowboy, his testimony is accepted. Therefore, if Reb Shmelke goes to Foxwoods once in a while, that would not necessarily passel his testimony in beis din if he was otherwise deemed trustworthy.
There certainly a satanic quality to compulsive gambling but the idea that a visit to AC or a Thursday night poker game will inevitably lead someone to the road to degradation is simply not true.