You may think you are ripping off your employer, but in fact it is the other way around in my opinion. This company has so much money, that their strategy now is to hire all the engineers in the world on retainer (that's you) so the hiring pool for the competition is diminished. That will raise the amount a smaller company (potential competition) has to pay (and ultimately make them unhirable). Maybe you should go find another job, but you might get a pay cut.