You seem to be admitting that the basic premis of bitcoins being generated by computer power is not worth using
Correct, mining with a CPU (as opposed to a GPU) is worthless, and solo mining on a CPU with the client (as opposed to with a pool on a dedicated mining program) is even more worthless.
and that's fine all I ask is don't promote this way.
We don't. We mention it as a technical implementation detail. If you tell us where you got the impression from, we can try to rephrase it in a less misleading way.
Where do the bitcoins exchanges get there bitcoins from?
The exchanges are just matchmakers, you trade with other people. Those people either mined when the network was small, mined them recently with a GPU, received them for goods and services or exchanged other currencies for them.