Since you are being paid "cash" up-front in exchange for a higher rate, it really is your own money that will be paid in the future through higher payments. Investors who fund these loans hope that you will keep the loans for long enough to recoup their up-front investment. If you refinance the loans early, both the servicer and the investor could lose money.

To summarize, zero-point/zero-fee loans in many cases are good deals. Make sure, however, that the lender pays for your closing costs from rebate points and NOT by increasing your loan amount. So if your old loan amount was $150,000, your new loan amount should also be $150,000. You may have to come up with some money at closing for recurring costs (taxes, insurance, and interest), but you would have to pay for these whether you refinanced or not.

Zero-point/zero-fee loans are especially attractive when rates are declining or when you plan to sell your house in less than 2-3 years.

Zero-point/zero-fee loans may not be around forever. Lenders have discussed adding a pre-payment penalty to such loans, however few lenders have taken steps to implement such a measure.