I'm wondering if gentoo really aims at average joe to use their OS. After some testing with Gentoo, I can conclude Gentoo is very suitable for taskspecific or powerfull machines, admined by skilled people. On low-end machines performance gain is lost in long compile times. On my desktop box, performance isn't much better because you have to select almost every possible flag for the compiler and compiling EVERYTHING can be a disadvantage compared to other out of the box distro's (update/installation time). This easy install gentoo, only adds compilation time and under the hood it's still gentoo, requiring avarage joe to be very skillfull
Besides that, you have to admit, data transfer is not that cheap. Providing (unwantedly) packages for a forked project can be a pain in the ..., reducing bandwidth for people where the files are intended for...
Finally bad experiences with easy-looking but difficult to master OS-es will only push people away from linux, instead of convince them.
ps: this opinion is based on my personal experiences with gentoo linux and so it's your right (or duty) to prove me wrong
pps: although requiring "advanced" skills to maintain and install, I think gentoo should be on the curriculum vitae of every self-respecting linuxaddict