Does Marketing always involve selling?

In the strictest sense, yes.  That is, if we think of selling as exchanging products or services for money.

But there are many occasions when we market our ideas.

Think of the preacher, politician, or crusader for a cause.  They market their beliefs and visions to others.  How successful they are depends on how well they can convince others to heed their message and take action.  To do that they must learn to communicate with the power of persuasion.

When you learn to communicate with persuasion, you have learned the basic elements of selling.

So, you can become an expert marketer and communicate your messages with power regardless of your desire for money.  It's a skill I recommend for everyone.