I look at marketing and sales being part of the same activity group. While sales is done face to face or via phone, in person, marketing is done without being in person.
That being the case, while there has to be differentiation with respect to your products and services, when marketing, when selling the customer should be able to clearly see a value in interacting with you as a person.
In my last post on this topic I listed some points to make yourself more endearing to customers.
If you can be remarkable in your ability to deliver value to the customer, the customer will remember and refer you also.
But the key is that you need to be very good.
Till next time then.