I'm not really concerned with Apple's financial interests. I'm concerned with their software tools and their demonstrated willingness to support the hardware they sell.
Lion is the _second_ version of OS X not to even run on PPC. Why should the developer tools they distribute for Lion support it at all?
Apple isn't actually stopping you from compiling for PPC. They just aren't shipping the compiler themselves. AFAIK, they don't ship any compilers for hardware they don't support — no VAX, no MIPS, no M68k — PPC is not special in that respect. I don't see what's so terrible about that.
Also available are 1.5, 2.3, 2.4, 2.4.1, 3.0, 3.1, 3.1.1, on through to the latest 4.x versions, free for the taking. All versions prior to 4 will happily build code for PowerPC.
What is it you think they're preventing anyone from doing again?