I'm going to eke by on a technicality, which this thread topic states, watch or read, it does not say BUY!
I got into this whole thing because I wanted to support good animation. It just so happened that I read a few manga, and got sick to death of reading American comic books afterwards. Some series, say Fruits Basket, you HAVE to read the mabga, or you just won't know the 1/2 of the story. And for me, even if you read the manga, you still may not get the entire story. Karin, or Chibi Vampire is another example, but even the manga cuts off too fast.
I think this argument is like deciding which is better, painting or sculpture. They serve two different purposes.
The biggest problem I have with manga, is that libraries or something like Netflix doesn't carry them, so I would have to actually buy them to read them.