[fjtorres]

The free ren percent samples are enough to tell if the author can write.
No guarantee the narrative won't go south later but it helps weed out the ones who can't spin a coherent sentence.
The same applies to tradpub titles. (And let us not forget how publishers screamed bloody murder when Amazon introduced "look inside". They prefer it when people buy their books sight unseen.)

Finding good reads isn't anywhere near as hard as many like to pretend.