Raster Effects Settings and Effects Size Relationship

Hi,
I've noticed when one of my colleagues has created a concept file with RES set to 72dpi, when I go to change the settings to 300dpi, the size of the effects changes. This kinda makes sense to me so I just go in and multiply the effects by 4 to get a hi-res simulation of the original concept.
What's confusing to me is that sometimes the effects do not resize, they remain the same but just look sharper and higher in resolution. This saves me having to do the multiplication procedure which is great. I'm confused as to why this happens sometimes and on other occasions does not. Is there a preference somewhere that dictates whether effects resize according to resolution?
I'm using CS2 by the way.
Thanks

Sean,
This post might help clear up some confusion:
http://rwillustrator.blogspot.com/2006/02/resolution-confusion-is-there-solution.html
:) Mordy

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paulskidmore wrote:
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but I asked the printer and he said 300DPI
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