Many AAA games have microtransactions. Look at FIFA - a 60 dollar game, and for FUT, more money on packs. Apex Legends is a free example of a AAA game with microtransactions. Overwatch initially had cost and dropped it. COD MW2 is another example.

In any case that makes the argument even stronger - the fact that games are offered free, shows that raising the price isn't as profitable as making games with microtransactions and simply making them free. The revenues are simply in another stratosphere.

Far Cry and Shadow of Mordor immediately come to mind as full priced games with microtransactions.