Do you think a religious leader should be involved in gambling? Do also accept his reason for engaging in gambling? Are these casinos right to ban him from gambling?
He should not gamble, not only because it is a sin that many religious adherents believe in, but we also cannot deny that gambling often makes players more involved so that it can interfere with other activities, especially if they are religious leaders where there are many congregations that they have to take care of.
The reason he gave was just an excuse and tried to cover up his love of gambling. If he wanted to be able to share then there were other things he could do that weren't gambling.
And of course casinos have the right to ban anyone they deem worthy of being banned from playing at their casino but banning will only make players look for other casinos, not make them stop playing forever.