Most of the books that sell hundreds of copies wouldn't have been published in the past. If you write a niche book about something and a few hundred people read it, that seems great. If you're (stochastically) subsidized by a few huge hits and bestsellers, that also seems great. People are reading the Bible, Harry Potter and celebrity memoirs? Great too, I'm sure they are enjoying them. Possibly many of those people have not chosen those books in preference to other more "worthy" books but in preference to other pastimes.
The only problem I can see is if you wrote a book and had it published hoping it would be this year's runaway success, and it wasn't. Fine, but someone's book was. By its nature not everyone can achieve this.