I've searched unsuccessfully to find a range of accepted value for a marriott reward point. I am trying to decide whether to use 150,000 points or about $875-1000 for a three night stay at a tier 2 Ritz. I usually only redeem points for packages that include max airmiles as this seems to be the best value. I don't know if a reward stay for a Marriott Plat. member might get us an upgrade, or if we should go with booking with an Amex. Plat. card (paying $ instead of points) and likely get the upgrade. Either way we don't earn stay nights or Marriott points so that doesn't effect (affect?) the decision.

What do you use as your value per point in making these decisions?