I dunno. I've never worked at a game shop, but the general belief seems to be that because the administrators know there are throngs of bright-eyed, bushy-tailed gamers just lining up to work at what seems to be a dream job, they're able to treat their employees like garbage. Poorly paid, highly expendable garbage. Not to mention the belief that some parents tend to use game shops as impromptu daycare centers... I've heard some real horror stories.
And man... You wanna work at a game store during the holidays? The measly little grocery store I work at gets pretty bad, but I don't even want to think about how much worse it'd be with someone calling my register every four minutes to ask if we have any Nintendo Wiis in stock, and then to yell at me about how I've ruined their family's Christmas by not single-handedly solving Nintendo's hardware shortage issues...
On the other hand, it's always nice to run into employees who aren't disgruntled and rude. If you think you can handle the work with a good attitude, go for it. I'm sure your fellow gamers will appreciate it, especially during the always-hectic holiday season.