> As a buyer, why would I use bitcoin internationally when I can't reverse my transaction if they don't deliver?
Sometimes reversibility just doesn't matter. The merchant might be 100% trustworthy (like Amazon). Or as another example I once rented a VPS for a month from Russia. I paid in bitcoins because it was $3 or $4 so I simply didn't care if the VPS provider didn't deliver (submitting a chargeback request for such a low amount is not worth my time), but at the same time I didn't fully trust the merchant with my credit card info (how securely do they protect/encrypt it? could they be hacked? etc).
> Since we don't gift each other bitcoins, Example 3 isn't a problem.
You completely avoided the main point of my example #3. And that's very stupid for you to say this. I gave some to my family, I could say this proves you wrong. Even Coinbase set up a page to give bitcoins last Christmas because it's common for enthusiasts to give some to friends & family: http://blog.coinbase.com/post/105032873402/give-the-gift-of-...
> Example 4 is laughable because in the last week, four Bitcoin exchanges were hacked (or robbed by the owners - still TBD) and people who had their coins in those exchanges lost it all.
This is completely irrelevant to example #4. My point was that a Bitcoin transaction cryptographically authorizes only the transfer of a specific amount to a specific address, and nothing else. In contrast a CC transaction lets a fraudulent merchant place any charge for any amount at any time. This is a substantial undeniable security advantage that Bitcoin has over credit cards.
> Skimming CC numbers is for sure an issue for credit cards, but as someone who has had their credit card skimmed, my issuer locked my account within 2 hours of fraudulent activity, called me, and eventually gave me my money back.
You were lucky. But your cute story doesn't mean credit card fraud is a solved problem. In many cases the customer has NO RECOURSE for fraud. For example you cannot chargeback a transaction made more than 60 days ago. Some fraudulent merchants pretend to act legitimately but stall shipping (eg. claim delays, issues, etc) for 60 days specifically to exploit this fact and exploit the fact customers don't know about this condition. Or if your PIN code is stolen and a fraudulent transaction is made with the PIN code, you will typically be held liable (check your credit card issuer's fine print, for example: http://www.scotiabank.com/ca/common/pdf/borrowing/revolving_...)
> How many Mt. Gox users got their money back?
Give your money to a fraudster and he will run away with it, no matter if its bitcoins or dollars. How much money was permanently lost to the Bernard Madoff ponzi scheme?