Apparently half the households in all America are signed up to Amazon Prime. So let's conservatively assume 200 million people in the US alone buy from Amazon.
10,000 people is just a little bit fewer than that figure. They don't give a shit about crypto. They don't need to give a shit. Almost all merchant adoption has been tiny or a failure. At this stage in its life it isn't what Bitcoin is for.
they don't just yet,they have a group of analysts that are paid ridiculous money to calculate such things
as soon as they check the figures and realise that accepting bitcoin as a form of payment is preferable for their business
they will do it ASAP,the current testing water gossip means that they do consider adding it,its just not the right time