How important are graphics in a digital gamebook?

I have an idea for a gamebook, which I would develop for mobile devices (Android, iOS). As I am no artist, I was thinking of how important graphics are for a gamebook.
In most gamebooks I read there were a few artworks throughout the game, but the main part was reading. Do you think this is still a good way to do it? Or do you need good graphics like the mentioned artworks to get into the story?

submitted by Rebusmind
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