Ten million in three days is an insane number.
Consider that the first month of an iPhone launch is a bit like holiday season for retail in general -- easily 70% of the years sales. Another 25% between the end of that month to around WWDC time and the last 5% during the summer from folks that either just don't care about waiting or for some reason can't.
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Well, Samsung counts sales to stores, not sales to end users. So they can easily sell 10 million phones on the first weekend, and then end users can take as long as they like to remove them from the store shelves.
True. 98% of Samsung sales are into the channel. Whereas Apple is its own biggest channel so perhaps only 30% of sales are into the channel. The rest are directly to end users.
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The Apple store I went to after work still had a line 30 deep out the door at 7pm Friday. The store still had plenty of stock.
The question isn't so much about whether there is stock. but if the stock is what the folks in line want. Last year many stores had stock all the way to close. But every other person wanted a Gold 5S and those had sold out on all carriers by lunch time.
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Has anyone been able to use

pay yet?
Outside of an Apple Store I wouldn't be surprised if no. I was under the impression that the stores weren't really expected to have the hardware up and running until Oct 1. Not to mention the banks needing to do their part.
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here fixed that for you Tim
Now now, lets not be racist. Some of the resellers are Russian or Armenian. Especially in LA.
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How about selling phones to everyone, not just self-centred Americans.
At this point in time I rather wonder if that wouldn't be the wiser move. Launch all countries together even if it means a more limited supply to each. More things to more online sales for in store pickup so that they can monitor for suspect behavior that could be resellers. Things like Apple IDs that were created during that order, use of gift cards etc. Also require that, at least in the US, all orders for the first month must be activated on a cell account even if the device is paid in full. Have the carriers help to vet folks that repeated sign up for multiple family plans only to cancel them the next day and other tricks.
if in store pickup had been active the whole week, especially with this kind of vetting, many stores might have found all their stock was sold before the doors opened on Friday, leaving nothing for the resellers. Sucks for them, better for everyone else. And since it's all by Apple ID its harder for someone to say that the store staff are being racist for refusing to sell to someone because they are chinese, russian etc when it fact it's the asking for 10 unlocked iPhones, no activation, paying cash by someone that just happens to be Chinese (and doesn't speak a word of english but just handed over a slip of paper) that was the flag.
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I am sure they are counting all sales including those who ordered online and are now waiting "3-4 weeks" for their iPhone 6 Plus. If someone placed an order this weekend and Apple has their credit card info, it is a sale. Why not include them?
If the card has been charged and a unit is in the process of being shipped yes that is clearly a sale.
But counting pending orders which have't been charged is about as heinous as Samsung claiming millions of sales which are just to the channel.