Now, the questions are, can we market Islam?
yes
can we incorporate the concepts of marketing to islamic preaching?
you mean identifying a need and formulating a product to fulfill that need, yes.
can we promote Islam in our own marketing ways?
this is where there might be a problem. "our own marketing ways" may be harmful to the cause of spreading Islam instead of helping it. it is therefore necessary to stick to the basic rules of dawa in doing this.
i think one of the easiest ways of marketing Islam is through our behaviour, and the examples we set for society. if we are able to make people see the beauty of Islam through this, i believe we can win them over.