Ask HN: Wacky or Alternative business models

Does anyone have some examples or experience with alternative or far-fetched business, adoption, or revenue models, possibly in tech? For example, billing for time spent using a piece of software to millisecond granularity? Paying for up front customer investment and charge incrementally later (Xerox), but for software consulting? Paying someone to embed/use a framework (AdSense)? What are some of the wackiest revenue and adoption experiments on the web? Did they suceed or crash and burn?