Not so much "smug" but knowing their income (relatives after all) I get to the stage where I feel like saying to them, "Do you realise that if you missed one session like this every week, you could spend 2 weeks in Las Vegas with us next year?" 

Before you all start saying, "Two weeks without you? What a bonus." They are always banging on about wanting to go with us but just never having the money to do it.