Aren't you curious to know, who can be your future customer the moment we exchange business cards?  

This was impossible with the physical business cards as it became difficult to track the number of prospects interested in your services or the number of cards that are wasted.
At least that data could help you realise the number of prospects not interested in your service, saving your time from follow-ups to wrong prospects.
Digital business cards have proven to be a far better version of paper business cards.