Wholesale T Shirts Produce A Profit

I recently attended a state wide convention of an organization that I belong to.  Many of the chapters had brought things to sell to the other attendees that could be taken home as a reminder of the week we spent together.  As I watched the sales proceed I notice that the best selling items were in the apparel line.  The t shirts were selling anywhere from ten to twenty dollars each and I knew that the screen printed Wholesale T Shirts were selling for less than four dollars each.  This was producing quite a mark up and a substantial profit for each group that was selling them.