All i can say on this is that if we are still in samsara, monk or nun or layperson, we are still subject to karma. Therefore, if it is 'bad' for the monks to be living 'luxurious' lives, then they will receive the karma for it. Let's not judge them because what the hell do we know. We do not know their motivation, so let us just respect the sangha for what they represent - the dharma community. They hold vows that we (lay people) don't. They must get their sponsorship of whatever lifestyle they have from somewhere and if their sponsors trust the monks, then we should respect their choice. If the sponsors don't like it that the monks are traveling by private jet, i am sure the monks would have no private jet to travel in soon enough!