I think "a $4217/mo CDN bill" may be a bit of an exaggeration :p I honestly had no idea how much CDN's charge, threw some rough stats into AWS Monthly calculator for CloudFront (596GB/Month, 500kb avg. object size) and the bill was only $73.87 /month. Call me surprised!
Sounds about right to me. How did you get to 596GB? That seems very low for 300,000,000 visits (remember this was a daily figure, but you're paying by the month). If you have 10 requests per visit (reasonable for the low end) that turns into a cool 3B requests. That itself is $2,250 a month.
A million visits times 500KB = 476.84GB. Per day, so 14TB per month. At best that's another $1,600 a month.
