Because new-developer market is huge. There are more beginner/intermediate developers than seniors by a large margin. It gets the clicks. As an anecdote our te

Because new-developer market is huge. There are more beginner/intermediate developers than seniors by a large margin. It gets the clicks. As an anecdote our technical blogs covering vital industry techniques and news get like 10% of the readers of our introduction blogs do. I'd imagine the best selling progamming books are the ones aimed at beginners too.