How is a kiss at the end of a date like a close on a sales call?

Answer: It is the natural outcome of a positive experience!
Getting a commitment to a kiss–or to a deal– is like the building of any relationship. It can’t be forced, or, if it is, the outcome is unlikely to be very pretty.  Closing a sale has to happen naturally as well. 
People will buy when they feel good about dealing with you; when they believe in the ability of your product to solve their problem; when they feel that the price is fair for what they are getting; and when they have confidence in your company to deliver service and quality. These bases need to be covered before attempting a commitment.
Now, to continue my analogy. Depending on the situation, timing, and the people involved, there isn’t just one way to kiss ( a smack on the lips, a full embrace, etc.) Similarly, there isn’t just one way to close and by