I just wondering , how can this type of mistake possible? I think fee are automatically being charged right. This is such huge huge mistake ever , I can't even imagine if that was me. Pheww. Looking at current btc price and 15 btc as fee. I'm going to shop and buy myself a rope. LoL !
Well first of all it might not have been a mistake at all. It might have been some flamboyant person trying to show off their stash of bitcoins. They might be the owner of a mining pool, confident that they would mine the next block and get the rewards anyways.
Also fees can be manually set or could be automatically adjusted if you are using an online or desktop bitcoin client.
But yes, if it was a mistake $15,000 isn't a small amonut...