And your experience is that there's no other factors in price than bandwidth, especially with international & backbone carriers?
Although I haven't directly worked at ISP, AFAIK, there are many different factors in price, the biggest one being QoS, which usually is defined how much bandwidth is guaranteed and dedicated and which are the endpoints of these connections and how to measure QoS.
I guess the price ISP's pay for other ISP's varies a lot and it really doesn't matter how ISPs pay to their upstream providers.
That's the thing though, you can't effectively measure data quantity caps to bandwidth requirements. You could cap all your users to 5 GB a month, but if all your users burst their 5 GB in the same 2 hour period, you're hosed.
ISPs pay on bandwidth and plan for peak bandwidth hours (usually 4 pm to 9 pm) like you said. QoS on pure Internet links is minimal, where I was, we reserved that stuff for telephony, since the IP network/backbone was dual purpose Internet and Telephony services. The telephony services didn't use the Internet upstreams, so the QoS implementation was mostly on our own backbone.
Plus a HTTP stream or HTTP download looks the same to QoS software. Unless you're using something like RTSP for your video/audio, you're not getting QoS for your Hulu or Youtube viewing pleasure (not to mention being a cable provider, what incentive did we have to make online streaming better ? Compete with our own VOD offerings ? )
And really, it was sometimes cheaper to have the level 1s just make up excuses for our failure to plan ahead or pay extra for bandwidth in the winter months.
So the "download" caps were/are just one big scam. For the longest time, we didn't even charge them to half of the customers because our monitoring software took a big dump on the old infrastructure after a router software upgrade from Motorola and a bug in the SNMP stack. It would make much more sense for ISPs to throttle bandwidth than data quantities in peak hours. Some do actually, on top of the caps. Download on-going for more than 1 minute at X bps ? QoS that mofo down at the last-mile router.
So while I was never privy to our actual cost of uplinks, talking to the network planner that was, about our only factors in price were who was selling the bandwidth and how much bandwidth capacity we had. Things might have changed, but I doubt it.
But there have been some studies done saying DVD and such may only last 10 years if you're lucky.
I must be lucky then, I again watched my now 11 year old Macross Plus DVDs just last weekend. Flawless as ever. Maybe I should try out my first ever DVD purchase, Costner's Robin Hood : Prince of Thieves. It too is 11 years old...
Then again, my Ride the Lightning CD still plays fine and it was purchased in the early 90s...