I'm not really sure what you mean, but absolutely using a CDN product is the way to go when you want to sell your content on a global scale. Otherwise, you are going to deal with having to build / maintain your own and the cost of doing that is far higher than just letting other experts deal with the issues that surround it.
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With these amounts of bandwidth, does that still make sense? Sounds like this was a one-man job that worked.
I'm not really sure what you mean, but absolutely using a CDN product is the way to go when you want to sell your content on a global scale. Otherwise, you are going to deal with having to build / maintain your own and the cost of doing that is far higher than just letting other experts deal with the issues that surround it.