Ugh, why would anyone build a mythic, let alone a Kenkonken?
it's such waste of money for a stupid weapon for a stupid job.
For the love of the job? The weapon may not be hands down the best in the game but it's the sense of accomplishment and love for the job which drives one to do so.
Why would people build afterglows? It really is a waste of gil for a boost that benefits party members and not one's self.
All in all, there are only a few things left challenging in the game. These are perhaps the last things. Making a mythic really isn't challenging, just time consuming. And no, it isn't a waste of money. Just because you can't make one doesn't mean, it's a "waste" of gil.
Now making an LS for just this purpose is a different story...
EDIT: Gib, I just looked at your char. LOL, you got me there.