As the indies for games, there also appeared a new generation of writers selling their novels as e-books ... for less than $1.
Indies are simply new in business, trying to create fan base and make enough money for larger projects. Or people who stick to a smaller scale in general. The usual price range suits both of them.
If the number of people involved is all that matters, the relevant comparison for AAA titles would be the price of the Encyclopędia Britannica. Expensive, trying too feed all needs, rarely entertaining.