> The name of the bucket used for Transfer Acceleration must be DNS-compliant and must not contain periods (".").

Source: http://docs.aws.amazon.com/AmazonS3/latest/dev/transfer-acce...

> The bucket names must match the names of the website that you are hosting. For example, to host your example.com website on Amazon S3, you would create a bucket named example.com.

Source: http://docs.aws.amazon.com/AmazonS3/latest/dev/website-hosti...

...

Looks like they don't want you replacing CloudFront with Amazon S3 Transfer Acceleration - which is a royal pain for some of my use cases (internal facing websites that don't need a full CDN).