How many nearly-identical systems does it take to be worthwhile?

Please direct your attention here:  http://xkcd.com/1319/
and here:  http://www.xkcd.com/1445/

I am going to point out, that the very first video on the getting started with 
puppet page suggests:  First know the thing you want to automate.  Refine it.  
And then automate it.  But if you've already figured it out and refined it, 
then the old-school thing I've always done up till now is to just write a txt 
file with copy & paste commands to run.  Automating seems to only be worth 
while if you're going to repeat it identically many times over, and I can 
barely understand why/when somebody would need to do that, unless they're 
managing a compute farm or a whole bunch of users' workstations or something.

My usual situation is like this:  Some business requires something like a 
drupal or whatever site published to the interwebs.  So I start with the base 
process to harden the base system, and then customize essentially my apaache & 
mysql templates - but there's always customization necessary.  Of course this 
company isn't creating an *identical* copy of what was done at some other 
company.  It's just a process I want to generally follow.

The obstacle that has always held me back from automating is the lack of demand 
for identical systems, *and* the requirement to have essentially written a copy 
& pastable procedure as prerequisite before you could automate.  So far what 
I'm seeing today doesn't suggest otherwise...
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