That's actually quite interesting. It reminds me that Japan as a whole has very low credit card penetration as well, and the primary mode of transaction is cash, even for items costing hundreds of dollars (or tens of thousands of yen, to be precise). Use of 10,000 yen bills (~$100) is routine.
People still have latent mistrust for handing over credit card information online. Virtually all courier services have a "pay upon arrival" option which allows you to pay for the cost of the item + the shipping when you receive the item. The courier then pays the retailer for the item cost.
edit: It may also have to do with the fact that the financial services industry there is even more sales driven and more scammy than its U.S. counterpart, and hence the public has a mistrust for all financial "products" that are anything other than super conservative.