Honestly why would I pay so much when I can use Summit for free? I don't mind supporting developers but 20$ is quite pricy. And the other price option are imho nuts. I paid for pro version of Boost for Reddit 4$, that's reasonable, maybe upto 10$. It's just an app for viewing content. It's not groundbreaking program or game.. And if you multiple the price x sales, the developers will make money anyway.