Can we erase .dmg files once the program has been installed?

Are the Disk Images and the .dmg files necessary to keep on your computer once you've installed the software? I mean does the program (any) have to access this 'placenta' in order to do it's job/ get more information? Is it continually exchanging data with the 'stuff' in here/or repairing itself? Or can we erase them?

For the reasons you outline, you can erase them.
Possible reasons for keeping them:
Sometimes software disappears from vendor sites. New versions replace old, but you may still want to use the old. It may be a resource should you need to reinstall.
An installer may also include an uninstaller utility.

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