3. Calling each and every one as often as reasonably possible (a few times a week). Squeaky wheel gets the grease and all that.
4. Offering to charge as much as possible to a credit card (let the card issuer get stuck with the default/BK).
5. For any loan that has indicia of fraud (especially zero to two payments), sue for fraud and seek punitive damages (the nice thing here is that a fraud judgment is generally NOT dischargeable in BK).
6. Run asset checks on every borrower, and try to find the ones that have equity in a house, equity in a car, or other assets, and file suit. Most borrowers will probably default, and once Prosper gets a default judgment, it can garnish wages, record liens on real property, and seize personal property.