Oh ya, I remember having to develop for and support a PowerPC based macs. Ya It was a pain in the ass. PowerPC mac OS X macs were freebsd based as well. They just changed from PowerPC to x86 Intel CPUs and recompile everything for x86.
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Part of it actually had to do with Apple not liking the slow progression of the PowerPC line from IBM. They weren't coming along as well as x86 chips. And with them purchasing NeXT they gained a UNIX like OS that could easily run on both with some work.
I think there will still be compatibility issues with wine, best to use Windows 7 pc or mac with boot camp for now.
Why bother ? Simple. There is a market for it.