Just speculating, but it could be a couple things:<p>Providing more choices can often result in consumers simply giving up.  At a former job we did an A&#x2F;B test where we showed some visitors two options to buy our product and added a third option for other visitors.  In the three option scenario, the bounce rate was about 10% higher.<p>Or, it could be that there are folks for whom bitcoin is linked with drugs, gambling, piracy, etc.  Maybe seeing a bitcoin option makes the site look less reputable.