In your opinion how could greed affect a salesperson? What are the results on his colleagues and how it would affect a sales process? Thank You

Greed is a killing behavior of any sales person's success.

Externally, customers will loose trust in the sales person, as they will notice that his major concern is selling and achieving more sales results rather than serving them and looking for their problems and needs.

Internally, it will increase unfair competition, jealousy, careerism and selfishness.

Besides, greedy attitude will encourage someone to concentrate on achievements rather than methods. So it will be easy to choose illegal, unethical and spurious methods to get these achievements. 

Greed make people tough and look nervous. No use of it neither for salesperson nor for anybody else. 

Greed may backfire

Salesperson may turn into a persona non grata

Item displayed and turn into a poor commodity

As a result of the actions of the seller

greed for what cause or purpose.

Assuming greed to take credit of others work? or passing on the buck for a bad job done?

Colleagues should correct such person if required report to the concerned person.

YOU CAN AGREE IN DIFFERENT WAY, ONE  WAS, INCREASING  YOUR OR HIS SALES PERFORMANCE.

SECOND WAS IMPROVE  ITS CUSTOMER ORIENTATIONS

IT CAN AFFECT HIS COLLIGUES IN POSITIVE WAY OR NEGATIVE WAY, IF HE BECOME COMPETETOR TO THEM  AND ANOTHER HAND IT INCREASES ITS VOLUME OF SALES AD BETTER FORMANCE