If there were PPC clones, the cost would be the same as the cheapest Win/Intel based solution you could find....think about it.
The PPC clone market* may have to reach the ‘economic of scale’ similar to the X86 market before it reaches price equalisation with X86.
One of the cheapest X86 motherboard** I can find**** is $~39 USD (An MSI MS-6340-010, for the Athlon/Duron based CPU). That's around $80 AUD.
*Non-PPC 4xx class.
**Not factoring the 'obsolete' Socket 370 Class motherboard, since they could go down to $19 USD.
****With referable reference (i.e. pricewatch.com).
PS; This is just the motherboards.
IF PPC* platform market is as large as X86, it may attract Microsoft’s attention e.g. Windows NT 4.0 PPC edition (as an example) OR Softwindows 95 (uses a licensed Windows 95 code; for the PPC MacOS platform). Now armed with dotNET ecosystem; different native versions of their said products wouldn’t be a problem.
Just a side note; Can MorphOS compete with a showdown battle with MS Windows XP PPC edition(speculation)?