emerge eggdrop configure /opt/eggdrop/eggdrop.conf put your system on autoupdate try to rehash bot sometime a month later and find out that the portage overwrote /opt/eggdrop/eggdrop.conf because /opt isn't a protected config directory. action to take: modify the ebuilt not to put any configuration files under locations where they aren't protected from upgrades.
That is what eggdrop-installer is for it creates a eggdrop bot in your home directory.