Cliffhangers are a good way to make the readers wish for more. Some people gets really impatient and buy the real thing(in this case, manga) for not being able to wait for it to fall on the internet. Besides, I think cliffhangers are a good way to make readers who didn't enjoy the plot very much to keep on reading, purely because of curiosity,and not because they liked it (me, for example. Althought I do stop after the cliffhanger)
Why is it that most of the greatest mangas are so full of cliffhangers?!...Urghhh it's so not good for my heart!
why do you this to me author-sama? ╥﹏╥