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Many commercial OSS offer paid support or support an "Enterprise" version of the OSS product. Zenoss ([http://www.zenoss.com/]) is a good example of this.

Personally, I see OSS projects that have this business plan as less risky since they are less likely to stagnate due to exhaustion.

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See also MySQL and PostgreSQL. They are open source and have free community editions, but they have paid enterprise features and support for those who need more than a database for their Wordpress site.

The donation model is almost never a good idea if your goal is to actually receive income.

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