I too looked around for these mileage offers. I refinanced once in Columbus (OH) in the early 2000s and received a 17,500 bonus on Delta. After further research, i found i would've gotten a lower rate with lower closing costs elsewhere, so it clearly isn't worth it. The average note holder probably keeps the loan at least 3 years, so think carefully if it is worth paying any type of premium for mileage. I think not. A better bet might be to list your house when selling it with a broker offering miles based on the price. If there are no hidden fees and you aren't risking the likelihood of getting top dollar for your house, that would be the way to go.