People's perspectives change on what is considered "sufficient".
Compare it to gas prices... gas around here is averaging 3.50 a gallon. How many people would be happy if gas was at $2.00 a gallon, Everyone would, but think about not too long ago when it was like $1.00 a gallon.

Since bows made it over 320 fps, all of a sudden 250 fps is not sufficient enough to kill a deer. i dont know about you, but deer skin isn't getting any thicker.