People don't normally look for credibility seals when they shop online. I don't. I must admit I get lazy when I have to check whether a company has a Hackersafe, Verisign, Better Business Bureau or TRUSTe logos. I am aware though, like other shoppers, that these logos do help increase credibility and shows that your company uphold secure ecommerce transactions.
But since people don't care too much about secure ecommerce until they get their credit cards hacked, what can the merchant do? Inform everyone. No, drill your customers about how safe buying your products and services are. Providing articles and newsletters that remind them your company is registered with trade associations such as BBB or Hackersafe can actually make them realize they can trust you, and therefore can buy without worrying about online fraud.
Displaying the credibility logos are not enough to show how safe your ecommerce store. Merchants should make it a point to make customers realize it. Create press releases, write blogs, and occasionally inform about security tests made on your site. No online store is safe from credit hackers and identity thieves. Even the most secure ecommerce retailers can be victims, so keep a close watch, and keep your buyers informed!