I'm a hoarder, but with varying reasons.

Initially it was for a round the world to celebrate turning 40, but work plans meant that the 3 months that had been agreed in principle 2 years ago, got reduced to 2 weeks.

Now I'm keeping them for "emergency" travel. I live in the UK and my family live in Oz. If I had to go home in a hurry, I'd have to stump up a lot of cash to buy a last minute ticket. Having the miles gives me at least the possibilty of a getting a flight at short notice for less than what I would have to pay otherwise.