Historically tapestry weaving was a trade. In the middle ages (and even through present times), weavers were skilled technicians weaving large designs created usually by painters. Today tapestry weaving has become an art form that is often practiced at smaller scales by people who are designing and weaving their own work.
Tapestry has a wealthy past as patrons funded the workshops that wove those large tapestries for their castles and country homes. Today tapestry weaving can be for everyone.
It is true that purchasing equipment and materials for any new art form can be pricey. There are many tapestry looms for sale that for many people are just too expensive to consider. And tapestry yarns can also feel out of reach when you have to purchase large amounts in many colors. But there are less expensive ways to find the materials and equipment needed.