Seems high to me....depends on your location.
I do not take mine in. I clean often, vacuum underneath with one of those attachment kits, oil the wick, clean the tension disc area, change needles. Never had a serious problem with any of my machines. I have been sewing for 50 years. Obviously started with mechanical machines..they are the easiest to maintain, used to oil where the manual told me...no problems. I save my money every year to buy fabric. If something goes seriously wrong with my machines, then it would have to go in. Most likely a mechanical/electronic failure is not due to cleaning issues, it is a part that is broken or worn out or your machine's timing is off. I had decorative stitches that were really wonky, so I called a dealer. They told me what to adjust....stupid me, I didn't realize that there was an adjustment dial under the accessory attachment that I could turn. That probably would have cost me $100 if I had taken it in to the shop. Now I read all of the instruction books, I test all the knobs and dials to see what they do.