It was an important discovery because they would be able to compare the inscription they could translate with the hieroglyphs. This ability would allow them to find the hieroglyphs that meant the same thing as the words they knew.
so that That way, the priests’ statement could be read by Egyptians who understood Greek, as well as by those who knew only one or both of the Egyptian languages
A sucessful logo would probably get more business than a unsucessful one. They would be more widely known whereas an unsucessful logo would probably not.