Oh! Makes sense. But sometimes, one of the markets falls and you have to short it, so you could just short into DGX and keep it there while you buy something else. DGX should not move in value anyway since it's backed by gold.

But I get your point. I have some ESP since a long time ago and even though it falls a bit sometimes, I think that it'll rise in the end. So I won't sell and I won't try to lower the sails and anchor my boat in GDX if I think that favourable winds are coming soon.