"Why every time some engineer invents something big his employer wants at first to keep this invention in secret instead of giving the engineer the big bonus to appreciate his work?"
History lesson -
"Despite the success of his game, Iwatani never received much attention. Rumors emerged that the unknown creator of Pac-Man had left the industry when he received only a $3500 bonus for creating the highest-grossing video game of all time." (lifted from Wikipedia)