@dw & Avid
Valid is a strong word. Maybe should rephrase that sentence but the sentiment of the statement still stands.
"I can dispute it later" is not a good security approach in my opinion.
I DO practise the same amount of care with my CC in meatspace, I dont let the cashier disappear to the back of the office with my credit card and I have a masking tape over the CVV to cover it up and check if its been mess with when I got it back.
Careless is defined as "Not giving sufficient attention or thought to avoiding harm or errors" and if you go around putting your cc number in places that you yourself are sure of the credibility off, then you ARE "not giving sufficient attention to avoiding harm/errors"
I am pretty sure that the site just probly have some images not in ssl which causes the message, I dont think that the SSL connection have been comprimize by a MitM and its probly safe to use the credit card here. And if you are saying because of that it is safe to use the CC, then I agree. But what I take issue with is when someone is adviced that it is probly safe BECAUSE you can dispute it later(which is what I feel is happening here).
What I am getting at is that being careless with your credit card and then saying that you can dispute it later is a simmilar approach to security as saying you dont want to keep your computer virus free cause you can just wipe it and reinstall later.
PS:Sorry that I put this as an answer. I tried replying in the comments and this is too long. Feel free to votedown/delete/whatever if you think that this is unappropriate as an answer.