Even better, because then you're giving another year for inflation to work its magic on rack rates, making those banked points even more valuable.
Financially, the most prudent thing to do would be to buy your full allotment of OTUP every year, use those first, and bank any extra current-year points into future years. Bank until you can't bank no more. Then when you have so many banked points that you're not able to use them before they expire, rent them out to clear the glut. You'll probably only get $20 per point for your rental instead of the $40 equivalent value from using the points, but it's still better than the $10 you paid.
I understand not wanting to deal with the hassle of rental, that's certainly fair. But it's not optimal from a dollars-and-cents perspective. MMB shouldn't net-cost anyone money.