In the time when Comic books became widespread, video graphics were not so developed.
All superheroes were born with comic books.
Large-budget films have been made seriously only in the last 10 years. Before that, we wouldn't have seen superheroes moving.
We would only see superheroes in dull pictures, with swollen muscles. Today this has changed completely. Now the superheroes are bloody and alive saving the world.
Of course, it would not be right to limit comic books only to science fiction.
Even topics such as love, drama, and history have been featured in comic books. Even some mystery-related novels have been handled very well in comics.
So do I need to buy books to read a comic?
It does not exist.
Of course, there is, but there is no need to buy a physical book. You can also read Comics digitally.
Comixology is a beautiful digital comic reading site. The company was bought by amazon after its great success.
Amazon purchases and adds many small and large companies every year.
These kinds of purchases are useful for their founders as much as Amazon. Because amazon's money flow helps companies create value in the long run.