A lot of technical painting books will state that it is better to have a handful of good brushes than many economical ones. This was another piece of advice I initially ignored, going through various low end brushes. A good brush does not make a good painting or painter, but can expand the possible applications of paint. These are tools, and like any other craft, quality can extend use and function. A good and maintained chainsaw, for example, will be more reliable and function to a point of improving the efficiency of your work.