You know, the big shame is, I'd like to run Pharos. It looks like it'd be a fun dungeon for a competent pre-made group. The problem is, there's really no incentive to run it right now, so getting a party run it without outside a roulette is very very difficult.
None of the drops there are that attractive. If there were level 65 or 70 Drops there, I think you'd get plenty of people running it. (Heck, with 65 or 70 drops, I'd have ran it several times just so I could have avoided the Tin-Can Darklight armor.)
Alternately, even if it offered additional Tomes over the other newly introduced dungeons, you'd see people forming to run it. A competent group can probably go through it about as quickly as 2.0 AK, so if it offered 75 Myth Tomes, you'd probably see parties forming up late every week to finish capping Myth.
Since it does none of that, and is clearly the most difficult of the new dungeons, people avoid it. Because people avoid it, the proper way to run it isn't very well known. Heck, I've beaten it, but I still don't remember most the boss battles too well. I don't really do High Level Roulette's, since I don't need them, so if I'm a little short of Tomes at the end of the week, I just run CT or one of the HM dungeons.
For context, I'm only 100 tomes short of Cap this week, and I've only ran CT once, and haven't ran a single endgame dungeon. Turns 1-4 of Coil, and farming Garuda EM, took care of the vast majority of my Tomes. I'll probably finish off my Myth, when I run CT again for my weekly drop.