As per the explanation of the fee, above our service fee is only 4%, the rest of the crypto fees is not up to us but we try to control it. As you said we're creating the technology platform that will allow users to easily buy cryptocurrencies, unfortunately not everything is up to us. We take the initiative on steem and enable Steem even for 10 euro vouchers knowing that this will create the confusion about our fees which is way more less than the assumption initially made then clarified by our friend @revisesociology. If you will buy higher amounts of voucher the fees will be very competitive. Your friends at Crypto Voucher