The default value in deployer config for https receiver's max size attribute value is 10MB.

Why is the default set at only 10MB?

We have seen many a times that when a page with a huge number of images is published, it fails. The resolution is to increase the max size.

What is the upper limit of max size attribute? If there is a max limit for max size, then please tell why this max size value is felt to be safe for publishing.