Obviously there's no way to measure this, but I suspect Prosper.org's growth has been done without the aid of many borrowers, which makes it doubly impressive.
In the old days, we had a lot of borrower traffic here, and the RML forum and Group fora were humming. Most borrowers however are transient, and are gone when their loan funds.
By killing the official RML, and erasing any trace of .org from the official site, most borrowers don't know about us. Nearly all of the Group fora are dead now, RML has slowed down a lot. So the borrowers aren't showing up anymore.
Which means it is the lenders who are chubbing up the .org stats...