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The main reason is that for the majority of people's websites went from notify me to out of stock. So therefore there were so many bots that clicked so much faster than we could, therefore getting cards. A person on twitter even stated that they managed to get 42 FE cards and now they're selling for £1000 at the cheapest on eBay. So yes I am blaming the bots...
It was also a Command line program so it didn't have to wait for site images or other stuff to load, just clicked straight through to the basket in mere seconds. (This 15 posts in 24 hours limit is going to be a pain)