For me it was due to there not being any competent luthiers in my area. The straw that broke the camel’s back is when I took my guitar to a “luthier” over and hour away to have my frets leveled and crowned. Two months, over four hours of driving, and $150 later I had a neck that buzzed like a bee hive with an action so high you could drive a truck under the strings. When I asked what the deal was I was told that I wasn’t used to a professional setup. Currently I need to replace a nut so it looks like I’ll be buying some StewMac files and learning how to set up a nut.