Guild Wars 2

Does anybody know why guild wars 2 is not on steam. But other game like first guild wars is on steam

Steam wants too much of the revenue ……

Because the game has enough revenue and playerbase to keep itself afloat and going in steam will largely take out of this revenue. Steam takes 30% of all the game sales and if you make the math if hot has sold(hypotheticaly)500 000 copies for 50$ that means steam takes 7.5 million from arenanet