I tried this for a little while and couldn't really get passionate about it; I have too many other backlogged projects that I was eager to tear into with LLMs and I got impatient. That was a while ago though and the ROI for building my own tools has probably gotten a lot more attractive.
I started building my own tool set because I was doing too many projects with LLMs and getting frustrated by a very real need for organization and tooling to get repetitive meaningless tasks out of the way and to get all of my projects organized so I could see what was going on.