1. keeping track of new CE announcements, particularly with retailers that don't often carry exclusives (like publisher's online stores or big box stores like Best Buy).
2. stores with exclusives that wont ship to where I'm located. I only collect north American releases because I don't want to have to deal with importation issues, sadly Futureshop in Canada refuses to ship to me in the US and they're only about a 4 hour drive away
3. Poorly made/poorly designed/poorly packaged CEs
4. CEs that are way over produced to the point where they're worthless.
5. the fact that so many crappy games get CEs and I feel compelled to buy them, while so many awesome games never get a CE release.
6. CEs with boxes roughly the size of a refrigerator, I'm ok with a simple SteelBook, really I am.