I don't think you should be spamming this everywhere, it seems like borderline libel. At the least this is misinformation, and feel compelled to post this reply to all of your like comments due to the apparent frequency at which you're posting this, and the magnitude of what you're implying.
"if you are smart enough to spot it."
Ironic... No offense, but you failed at a basic understanding of ratios.
Your math is off. It should always be the ACTUAL/TOTAL. In this case that would be the payment (after the fee)/cost of a single coin --> 961.63/12638.74 = 0.076085907BTC... Ergo, you're actually getting exactly what is expected (0.07608591BTC) from direct calculation using the correct numbers. There is no "secret fee", at least, not based on this evidence.
The site shows (on the right) that the coin amount is coming from the [total minus the fee]; whatever amount you enter is includes of the fee. In other words, you're only getting 961.63 worth of coin when you pay 1000 due to the fee, just as the website/receipt implies. If you wanted 1000 worth you'd need to pay something like 1046.
I am aware of the fees, I started noticing this kind of manipulation in the rate showing on their screen only when the time bitcoin is falling...and its not for the first time I buy this amount of Bitcoin from them and they are not the only exchange I trade with ...
I posted this video for the ones who are blindly trusting any broker just because they are controlled by big players... You are totally right about the fees but not that much...I have another video that the gap is more severe :
And to me who is not a smart guy like you, and obviously not a perfect accountant to see these tricky "formulas" that you spotted ...I just see the amount that I put fiat and the Bitcoin I receive based on coinbase market rate...