I’ve been “making” my own arrows for years. The real answer is “it depends.” If you buy raw shafts on sale and already have many of the tools (ie arrow cut off saw, jig, clamps, and inventory of vanes or feathers etc.) Or better yet buy used shafts on here, I would strongly argue yes especially over time and if you shoot a lot besides hunting, it takes much longer to meet that level of diminishing returns. If, however you don’t shoot a lot or rarely change your setup or just don’t go through a lot of arrows then it’s probably most cost effective to buy your arrows already made. I do it because I like being in control of the entire process and tweaking my arrows etc. Spinning them for spine alignment the whole nine yards. It’s kinda like reloading. Nowadays with all the components for that and initial start equipment costs, it would be hard to justify on purely a cost savings basis unless you shot a ton!!