whenever I see a request to provide credit card details upfront before trying a service, it subconsciously screams to me: "Scam! Stay away!" I would never give

whenever I see a request to provide credit card details upfront before trying a service, it subconsciously screams to me: "Scam! Stay away!" I would never give you my cc details in order to try your product. In fact this would put you firmly on my blacklist of sites never to visit again (unless you are some big well-known vendor of something I need).