It's not emulators that I'm questioning their legality, it's the fact this one has a price to download! Isn't selling an emulator just as illegal as selling bootleg consoles without Sega's permission?
We can't compare emulator to bootleg consoles.
Emulator is built using clean-room reverse engineering and does not contain the original manufacturer's copyrighted code while bootleg consoles are the opposite.
And about emulator's having a price, there were lots of them before.
Remember Bleem! in 1999? It was priced at $29.99 in the US