Seems like an example of how it's easy to be "fastest growing" when something is really small. These loans started about five years ago and the cumulative amount loaned is about $3.4 billion. Most of the activity has been in the past year, so of course the rate of growth is over 100%. But the absolute numbers are utterly tiny. For perspective, subprime loans peaked at over $600 billion per year, and total mortgages outstanding are around $14 trillion.