I myself have that same limit! The only exception 
is hankens (if I ever find one that suits me). 
And so far it's been really nice to make me stop 
and think about what I -really- want, and what is 
impulse. There is a fine line between the two 
that is hard to distinguish. I find, if I like a 
cel enough that I go and visit it at a dealer's 
site, that usually lets me know it's more than 
just "impulse". And as much as I would ADORE a 
VHD: Bloodlust cel...I am NEVER paying that much 
for a cel where you can't even see the 
character's eyes.

I adore this hobby, but sometimes the prices 
astound me. I understand they're collector's 
pieces. I understand that feeling and value are 
often attached to them and that's fine if you're 
willing to pay it...but frankly, this is stuff 
that, until not too long ago, was considered 
fodder in the production process. There are 
millions of cels for a certain anime alone. In 
the end, as much as I love them, I have to put 
life in priority to what is, essentially, a piece 
of plastic that's been painted.

-Misha