These days Thomas Kahl pointed me to an interesting fact: many VirtueMart-based online-shops offer coupons! Not that they know of, but you can redeem coupons and buy at a cheaper price, because the sample coupon codes are still valid. If you are not sure if you have the sample coupon codes in your store, you should immediately check it. If you find coupon codes like "test1", "test2" and such, just delete them from the coupon list. Not a security issue, but something you should be aware of...