I watch Spongebob at least once or twice a week and look forward to new episodes...
And I read more then any person I know. So there goes part of your theory.
(Oh, and I am totally sleeping on Spongebob bedding, I am not even kidding. I have two sets of sheets, and 1 comforter --I would have two, but I opted not to get it.)
Anyway, I guess my guilty pleasure is old WB shows. I just bought/watched all six seasons of Dawson's Creek. And I own all but the last season of Gilmore Girls. And I have all 7 seasons of Buffy, my sister has all 5 seasons of Angel. I want to get seasons for the original 90210 (just out of curiosity), and my sister suggested that i get Felicity... Basically, I am sucker for shows that are no longer actually on television.
Oh, and I suppose yaoi manga is a guilty pleasure too. I forced my sister to go to Borders with me so I could see if they had a new volume of a series I have been waiting a friggin YEAR for, only to find that they didn't have it. I was sad...
And lastly, I guess you've gotta add X-Men to the list. If I find -anything-, no matter how silly or unnecessary, that is X-Men Related, I have to buy it because I know I would never be able to find it again. This is how I acquired a Wolverine pencil topper, a knock-off Pez dispenser, and various action figures.