You don't have to log into a getty on every virtual console anymore:
just run a single getty on tty1, put this line in your /etc/inittab:
and put this in your rc.local (or equivalent):
echo "alt keycode 103 = Spawn_Console" | loadkeys
Then, once you login, you can press alt-up-arrow to spawn another
virtual console. This behavior requires a recent sysvinit package.
I used 2.64, but as early as 2.60 might support it. You also must
be using the proc filesystem.
WARNING: this may circumvent vlock.