I'm not sure about the rationale behind this, but I believe it's
a deterrent against fraud seller. With the Credit Card details,
actions can be taken against them.
I'm hoping that all buyers will also be required to have a credit
card verified account cause there's a lot of unrated buyers who bid
on your items and disappear once auction closes.
BTW, I'm a frequent users on SG Yahoo! Auction, with over 100
ratings. I'll say Yahoo! Auction is a better place to sell, eBay
Singapore is simply too deserted already. Probably due to the
requirements of having a CC / DC to open the account.