For some temptation is chocolate. For some, gambling. For others, smoking or alcohol.
For me it's 720 pairs of used but good blue jeans: Levi's, American Eagle, Calvin Klein. For $.14 a pair. Or rather $100 plus shipping. Just think of what you could do with these jeans! Resale in a thrift store ... online sales on eBay. Unlimited pairs for the kids -- never having to wash jeans again (or at least for a long time.) Gifts to the homeless. Crafts/quilting.
My imagination boggles at the possibilities.