Why I cannot use the stadnalone debug agent to debug all Blackfin and Sharc processors

The price of USB-Based Emulator and High Performance USB-Based Emulator is very high. The price of Standalone Debug Agent isa very democratic/ But I cann't to use him in my target boards? The emulator for all TI's processors is very low шn comparison AD's emulators? Why?

Why a policy on distribution of a product less flexible than at the competitor