All part of the hobby.  There's one Slayers cel 
from a few years back which still haunts me... 
could have had it, decided that it was 
overpriced (which it was), let it pass me by, 
and only then started realizing exactly how much 
I liked it.

That was the point where I realized that a cel's 
value has nothing to do with the market and 
everything to do with your own personal taste.  
If I had the chance to go back and buy the 
overpriced thing, I would -- it would be an 
investment in my own happiness.

Now, with that said, the opposite holds just as 
true.  I also regret several cels that I HAVE 
purchased, ironically enough for the same reason 
that I regret not getting the one I mentioned 
above.  I couldn't shake the feeling that I'd 
paid too much for each one, and that ate away at 
my enjoyment of them.

As a result, my rule has become "buy something 
because you love it... don't spend more than 
it's worth to you... don't buy something just 
because it's an "important" scene or a pivotal 
character... if your toes don't curl at the idea 
of having it, leave it for somebody else."

And, heh, as a side note, like Chip I also have 
a folder titled "the ones that got away".  We 
must enjoy self-flagellation or something...