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I'm sure that every coiner will understand the fees.
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I´m not so sure about this. Most Bitcoin ATMs that I have seen
are not exactly transparent about the fees that they charge.
Instead of displaying in red letters that you are paying a 6 %
fee to cover the costs of the operator and the BTC transaction, they
simply give you a worse rate that includes the fee.
By doing this, a newcomer may be completely unaware that he
is getting screwed by an uncompetitive rate.
Professional buyers surely don´t use these ATMs, because why would
you want to pay a 6 % premium when you can buy Bitcoin at an exchange
like Bitstamp for 0.25 % in fees.