The reason you have a problem is 0 is also considered equal to false, when the get_post_meta call returns false, it’s also the same as being equal to 0.
if( !get_post_meta( $post_id, 'some-non-existant-field', true ) == 0 )
Would be the same as …
if( get_post_meta( $post_id, 'some-existing-field', true ) == 0 )
..the only difference is in one case the field doesn’t exist, and in one it does(and has a zero value), both will be true though.
Additionally, 0 is not the same as '0', ie. one is a string value, the other an actual numeric value. Custom field values are stored as strings, so your comparison should go along the lines of..
if( get_post_meta( $post_id, 'some-existing-field', true ) == '0' )
.. to be accurate.
I realise i’m bad at explaining this, so i hope that helps(or someone else explains it better).
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