Coil Turns 1-3 Are about an IL65 minimum, I'd say.
Coil Turn 4 is about an IL70 minimum.
Coil Turn 5 probably is an IL75-80 minimum (who expects to beat Twintania with just DL?)

For those who are Clearing Twintania, the only purpose of Crystal Tower gear would either be for ALTERNATE CLASSES or for VANITY SYSTEM released in 2.2. However the fact remains that less than 5% of the population of the game (30,000) are clearing Twintania. The fact remains that probably less than 10% of the subscription of the game (60,000) are actually even doing Coil on a weekly basis.

So you ask why to run CT? With the Myth Cap increased, CT is dropping Philo and Myth. When 2.2/2.3 comes out with the 3rd Tome, it will probably also have the 3rd Tome added to it. What you hear on the forums (and you yourself are) is the Vocal Minority. Also, you can keep running CT each week until the 1 item you want for that week drops and you obtain it (so long as you aren't Greed-Spamming/Not-Rolling and obtain something else).