Interesting numbers, a good read, Takemehomegrandma. Cheers for posting it.
As for why things haven't migrated to a more modern platform, God only knows. Niche market, no financial reward for the amount of work, who knows.
Some people say if they wanted a x86 or other modern chipped Amiga, AROS is there. A valid point. I've often griped about HW issues with AROS, but the truth is it runs very well on supported HW and that HW list is getting bigger day by day.
The MOS camp have the luxury of the OS running on extremely cheap, readily available PPC Mac's. This has served them very well, and the OS is great, the old PPC Mac's are still easy to find. It won't be that way forever, though - and I imagine they are looking towards more modern platforms for future releases.
AmigaOS? God only knows why they have stuck with it (PPC). My only guess is because PPC is what OS4 runs on now, and perhaps there's simply no manpower or financial rewards to port the whole OS over to ARM or something for them. Then again, the first thing I'd do with OS4 is make it run on PPC Mac's if I ran the show there atm. It's a niche market, and OS4 limited to expensive PPC embedded boards is a true shame.