Uh, NO, like I said, the Hydra takes only five minutes, it's quite easy to do and easy to get the reward. After all, seeing as it's a guild boss, you aren't doing it alone.
I will tell you exactly why the Sand Devil's Necropolis and the daily for it is so messed up.
First of all, you claim you can gain the oil from Stage One? True, but with 45 oils needed to upgrade an Artifact to even if you're lucky enough to 5 of them each time (and trust me, you won't) that means 9 runs and 72 energy. One Greater Potion is not worth that.
And the Boss, while not difficult, is annoying and time consuming. Do you know anyone who enjoys anything about the Fire Knight and Spirit Keep Boss (other than beating them)? This is the same thing, just more annoying. Not being able to use debuffs at all (including Heal Block) except at certain times and not being able to heal turns this into a slow slog, and don't expect to find any way to set the team to be able to do it on Auto. I believe the only champion who can make this fight somewhat easy is Muckstalker, unless you're rich enough to equip your party with the Daze set and change the armor when you need them for anything else.