Another thing is what's the point of the pendulums? Just to get another type of ether as well as your main with just a single card? I've seen a lot of T50 using them rather than the pillars/towers and I don't see any other point... Then again I use a mono-fire at the moment so.. >.>
In monos the only purpose of using Pendulums is to split your stack into 2, so that Earthquake has 2 targets and is less devastating.
In duos where you would use an even amount of each element pendulums increase reliability. For instance if you needed both Water and Earth, with just pillars all your

may be at the front of the deck and all your

at the back. A pendulum makes it so you have ½

and ½

in one card, making you less prone to bad draws. In this example though Earthquake would have a stronger effect.
You will also notice a lot of ninjas on this board. (

willng3)