How do I install Commerce Kickstart as a Aegir installation profile
If you download the .tar.gz from http://ftp.drupal.org/files/projects/commerce_kickstart-7.x-2.0-rc4-core.tar.gz into your platforms directory on aegir, untar it, and then create a platform with the same name you can build sites using the commerce kickstart profile with aegir.  Here are the commands I used:

cd /var/aegir/platforms
curl -O http://ftp.drupal.org/files/projects/commerce_kickstart-7.x-2.0-rc4-core.tar.gz
tar xzf commerce_kickstart_7.x-2.0-rc4-core.tar.gz
mv commerce_kickstart_7.x-2.0-rc4 commerce-kickstart
chown -Rf aegir\: commerce-kickstart


Then go into Aegir and create a platform.  Set the platform directory to this commerce-kickstart directory and don't include a build file.  It'll verify the platform and then you'll be able to create sites on there using the Commerce Kickstart installation profile.

Cheers,
Diwant