Sentence:  The <WSD>Rainmaker</WSD> absolutely believes, without a dollop of doubt, the he or she always improves the customer's current state. The <WSD>Rainmaker</WSD> knows that if the customer does not buy, then the customer loses something, and the <WSD>Rainmaker</WSD> loses the sale. 
Meaning of the word marked with <WSD> tags:  A person having the ability to generate business, raise funds, or otherwise engineer success for a company, organization, etc.