What's the granularity of a Reddit API call? Is e.g. loading a submission with all the comments, or loading the top 20 submissions to a subreddit a single request? Or do you actually end up doing tens of requests for what's effectively a single page load (one for the submission and a few comments, one for the each image, one for each additional batch of comments)?
$0.24 for 1000 full page loads wouldn't actually sound insane (if you compare to typical CPMs of sites with ads), but it seems hard to believe that the average user is doing that 350 times / day.