Per Christian (the Apollo app dev): "(...) Twitter's pricing was publicly ridiculed for its obscene price of $42,000 for 50 million tweets. Reddit's is still $12,000. For reference, I pay Imgur (a site similar to Reddit in user base and media) $166 for the same 50 million API calls." [1]
All assuming he is not lying (which I have no reason to believe, contrary to the reddit reps). Two orders of magnitude over Imgur pricing sounds a bit greedy, unless Imgur is also at the verge of collapse, which I'm not aware of.
[1]: https://old.reddit.com/r/apolloapp/comments/13ws4w3/had_a_ca...