The main difference between a beginner VL80 and a professional VL928 violin is the tonewoods, design, and craftsmanship. Professional violins used seasoned rare tonewoods that result in a much resonant tone. If you're playing in an orchestra, you need a certain level of sound quality to match the rest of the instruments, which usually are also expensive. Another major difference is in the reliability that a professional violin offers. They rarely have tunning issues and are made to last for many years, sometimes even improving the tone. On the other hand, a beginner violin is meant to be replaced after a few years of playing to level space to a better one.