Hey, No fair!
That's my idea.
I had cunningly realised that I could save my precious pennies, avoid braving the pre-Christmas town centre, and give my family presents of vouchers entitling them to a flight with me.
Well, I figured, they have all said they'd love to come flying and I was already going to take them up for a jolly, and I have to spend money on hour-building anyway, so why not? I'm not going to fall foul of any law because I'm not charging them.
Everyone wins!