[gavanwoolery]

Yes, they are relatively cheap on their own, the only problem is the added cost of a discrete card in addition to a cpu, and potentially a better power supply to support them both. In terms of many people's budgets it is nothing, but I am talking more about the average consumer. In the end, buying a desktop with a decent discrete GPU and CPU is probably going to run you at least $800; again, not a lot, but if this company could offer a competitive solution for $100, it could drive more "mainstream" adoption, although that is probably wishful thinking at this point.

[astrodust]

Don't forget that nearly all Intel desktop CPUs come bundled with some kind of embedded GPU. It's nowhere near as powerful as a separate GPU chip, but it's still able to do OpenCL. The Intel HD4000 GPU may not be state of the art, but it out-performs the CPU for GPGPU-type operations.