To me having a large and up-to-date repository is always a plus. In fact, it's probably one of the most important features. I like a distro that I can equo, urpmi, or apt-get me whatever obscure piece of old software that I love. The less of these I find, the less I like the distro. Magiea is doing pretty good, but it's missed one or two*. Sabayon always had whatever I wanted - almost always. I'm sure there were times I might have been disappointed, but I can't remember any.
This, for me, is probably the most appealing aspect of Sabayon. I can rely on being able to get hold of the latest and greatest applications available for practically no effort.
Keep up the good work.