toddler, your kinda wrong
the main apache process is ran by root (OK), the rest of the childs are forked off as nobody or www or whoever you set
also as far as pushing 100mbits/sec off 1 link sure, protocol overhead is still real traffic hence if you do 90mbps + 10mbps protocl your still pushing 100mbps on MRTG
and i've seen about 97mbps utilized for HTTP on MRTG
(on a 100mbps link)