I still don't completely get the borrowing against your bitcoin. You'll end up having to pay that back with interest, so it's going to end up costing you more assuming the price stays the same.

Are people just banking on the assumption that it's going to go up higher than how much they have to pay back over time? What if that stops being true 5 years from now somehow, like another coin becomes dominant? Not saying it's likely, I do think Bitcoin will probably still be doing well in 5 years, but I'm not certain of it.