I think I've changed the needle maybe 5 times in 25 years, and made probably 50-75 projects in that time. (quilts, Halloween costumes, dog coats, etc) I only change the needle when it bends, breaks or gets obvious that it needs it. This isn't about $$$. I just don't think about it. However, I sew with a 1940 cast iron Singer. I'd probably do things differently if I changed machines....which will be NEVER!!!!