@ OP
Yes, exactly.
Rather, FX is aimed at a different market than the APU's. ALL FX series CPU's are able to be overclocked, only a few APU's are (ones with 'K' at the end of their model name).
Another to thing to take note, do you really think an FX user will use integrated graphics? 9 times out of 10, anyone buying a high-end CPU will pair it up with a very beefy GPU. Someone buying an APU isn't buying it for the CPU power, rather the GPU power that it can provide to save some money.
This is why there is two different markets for FX series and APU's.