Why is the idiom of offering it for free (100% that is) and then look out for supporting the development? How can you honestly do both? Instead, place it for 1

Why is the idiom of offering it for free (100% that is) and then look out for supporting the development? How can you honestly do both? Instead, place it for 14 day trial, offer the entire thing cheaper by 99% (leave 1% fan club away), and support both the causes sufficiently.