Computers with Mactel hardware?

If anyone can explain to me why Mac OS X-compatible hardware budget offerings from third party manufacturers aren't popping up all over the place, I'll be glad to hear it - sure, they couldn't deliver them with OS X pre-installed, or they'd be liable. But there sure must be quite a few customers out there wanting a slice of OS X goodness without the price tag! (Who cares if the customers break the license terms?)