mainly for the same reasons as everyone else has
just told you.  I think they look tacky.  I,
myself, am EXTREMELY (and I mean EXTREMELY) picky
when it comes to choosing cels because anything I
buy will be framed sooner or later and these cels
cost me a bundle.  The thought of having someone,
regardless of who they are, tamper with my cel
makes me cringe.
*runs over to hug cels*

Star Phoenix