I got the piercing after reading something somewhere that a daith had helped someone else.
I am no stranger to bodyart / piercings and I have a passing interest / experience in acupuncture / acupressure. So the idea it could help appeared worth a shot, so I went for it. I did not think "this will work", but hey, nothing ventured ..
I would not describe a daith as an aesthetic piercing. It is very discreet so not a 'showing off' type. The placement also does not lend itself to changing the usual steel ball closure ring which is initially placed. I did not think through what I would do if it did not work because I am visibily modified and this extra was a nothing.
My daughter has no bodyart. Standard ear-gun piercing, one in each ear. She took some convincing, but all I could say was "This worked for me, I'll pay, there is nothing to lose and much to gain". And it worked.
What I do not know is "If I removed the metal, would I get migraines back?" and I'm not about to try.
Here is something to try: My late wife would have bad headaches. If I squeezed the web between her big toe and the next one the pain would fade after a few minutes and if I continued the pain would stop.