It's not the only way to get a 235+ weapon you know. Even with crappy rng, this takes waaaaaaaaaay less time than the relic or presumably the 245 from a8s, and nidhogg can give you multiple weapons in the time you get one from here (depending on how fast you can learn/clear it).

Besides, you get exp on non lvl 60 classes and tokens for the mount/minions/materia for each floor 50 clear and a rare chest drop. It's not like you're leaving empty handed anyway