Bandwidth for the videos was provided by Amazon S3 directly[1]. So if he brought in half a million dollars in 5 days from selling his video at $5, that's 100,000 purchases, and if everyone only downloaded the 720p video at 1.2GB that's 30TB per day, hosted only at Amazon's Northern California location, it would end up costing almost $10,000 in bandwidth (priced as an entire month). Shit aint cheap, but at $5 each, he makes a decent profit. That's just for the 4 days he provided numbers for.

[1] The link download link ends up resolving to http://download.aws.louisck.net/ (even if you stuck the video filename on the end of that, it's a signed URL, so you're SOL unless you go through his website after paying him money)