I don't think its fair to include the MAS or MAP sensor either, not if you're comparing it to the price of just the DSMLink. You would need those same pieces if you were to buy a DSMLink, or a used AEM. Besides, most guys interested in this already have a 2G, 3G, EVO, MAS or MAFT setup.
You would need the same 2G/EVO knock sensor if you went AEM, but its a valid argument if you are comparing it to DSMLink.