No, it's not a traditional pricing model, but if your product or service can stand some revenue diversification, "pay what you can" is a great way to shake up your market presence.
In some cases, it's a great way to reduce production costs, which is exactly what the rock band Radiohead did with an album release. Go ahead and download. Then pay whatever it is that your willing to pay for our music. "It's up to you," the band wrote. 1.2 million downloads and the band grabbed some serious attention.
Another one is events. Trade related events are taking a major hit now. However, if you don't get people to your event, you're toast. Some organizations are applying a "pay what you can" model, then turning it around on vendors, sponsors, advertisers and visitors for some creative revenue diversification. If your model is particularly compelling, and "pay what you can" is compelling, others will want to leverage (and pay for) the opportunity to be involved.
Bonus tip: make sure you're marketing related to any "pay what you can" promotion is heavy hitting. "Pay what you can" is an eye opener, but only if you do something to get in front of those eyes.
Design an effective "pay what you can" promotion...