The GB are flush with money, being able to take their wives on these holidays. With so many cutbacks and laying off long time Bethelites you would think that they might realize that taking their wives with them on these trips is an extravagance they could easily do without and therefore saving the sheepies money for more important uses. Most business people don't get the benefit of taking their wives and generally they would consider it a distraction anyway. The President would be one notable person who travels with his partner, the same as the Queen and this is done for strategic reasons.
It may be a matter that these highly moral men need to have their wife with them to keep temptations away. So much for putting Kingdom interests first.