Besides the points raised earlier, think about the principles of "Supply and Demand".
Japanese animation have already made a global impact in entertainment, in fact anime is already one of the leading forms of entertainment not only in Japan but in some countries as well. Try checking the programming of countries like Hongkong, South Korea, the Philippines, et cetera and you'll see what i mean. Now, because of this growing demand inside Japan and all around the globe, the supply grows as well thus leading to more episodes and a quicker pace in releasing 'em.
With that being said, you should also be able to understand that demand becomes one of the factors why anime tends to beat around the bush more than its manga cousin and why it strays away from the manga in terms of pacing, plot, and the other stuff.
Now, because i mentioned manga, the quick release of episodes of some anime series is also dictated by the manga original even if there are a ton of fillers that are slipped in between the original arcs.