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Here are some examples how to use it in a meaningful way:

Use Case 1: Special Prices by print technology

Similar to the above example you might have two different prices depending on if you are selling black and white or color ads. Therefore set up two ad prices which only differ in the rate criterion and price:

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If you product is exclusive don't forget to set up the ad spec selfblocking to make sure that you only sell this page once. 

Use Case 2: Special Prices for Weekdays - Weekends

Configure your picklist values to map your pricing policy. In the below example Monday- Thursdays are the cheapest, Sundays the most expensive slots for this product. 

Use Case 3: Video Time-Length Prices

You can manage your video length with rate steps or alternatively use the rate criteria on the ad prices like in the following example.

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