Lupine - You are just looking at the basic chart. Go to front page of marriott, put in your details and then click the check box for use marriott rewards points.

You will then get results. Note, it will only show hotels with availability for the date range you selected. If you want to further narrow it by category, on the left side on the filter, the last option is by hotel reward category.

The tiers are for ritz carlton's.

Cheers.