Here is a review of sales calls needed before a prospect buys.  I have watched this and experienced this a lot. A majority of sales people cannot take the rejection and really do give up after the first contact.  As the president of a company I experienced the one call and never call back syndrome over and over again.

Successful sales people get past this:

Prospect — (Qualified to need and buy your products)

Contact # 1   50% of sales people have given up

Contact # 2   65% of sales people have given up

Contact # 3   79% of sales people have given up

Contact # 4   89% of sales people have given up

Contact # 5   Just now you are becoming a factor in your prospects mind

Contact # 6   Nurturing slowly, your prospect is getting to know you

Contact # 7   You can harvest low hanging fruit

Contact # 8   You are probably the only person to make 8 contacts with this person

Contact # 9   At this point when your prospect is ready to buy you have a 90% chance of being called

Contact # 10

Contact # 11

Contact # 12 Customer