Why is AOM EE never on Sale

I remember AoE EE used to be up to 75% off on Steam Sales all the time, which made Sense bc it was an old game.

In the past year or two however, it hasn't been on Sale even once, despite newer remakes such as AOE 2 DE and AOE 3 De being on sale quite often. Does anyone know why this is and if it ever will be on sale again.

Unfortunately Key Sites such as g2a aren't exactly much cheaper.

This is quite unfortunate, as I own the game and would like to play it with friends who have lowend systems but don't want to pay 28 bucks.