"1) The other 2 lines suck too much to use
or
2) Wind is real cheap.
I dont think it is #2..
LOL I am pretty sure tis #2... and #2 alone...
For to make ice and earth as appealing as or even more appealing than air you'd have to make the other speclines just as cheap as air is...
Now excuse me... how are you going to make them more appealing than what air has available?
You need only mix with enough earth to get the 10 sec PBT. Doh you would get the ghetto mezz? Your ghetto mezz is just what most part of the Healers on Midgard get since most will go only 39 Pacification.
Now combine it with your 2000 range chain stunning pets and the highest damaging dd and you have something... Simple combo mezz some pets dd dd and a dead target...
Air theurgists are even cheaper against Mids... Since healers aug line just plain sucks Mids don't have the spirit resist buff... So an Air theurgist DD nukes like this against 29% spirit resist lvl 50 toon.
http://www.shadowkan.com/sb/lori.JPG
540+ dmg per dd for no need for debuffs
"there are far more cheap lines in the game, and in Albion to play. And all the evidence points to #1."
Far more cheap lines? Nope, in Albion there are classes as cheap as Air Theurgist...
Example the 437 dmg in the pic above is from a necro (necros can also abuse of Mid lack of Spirit resists)... And there's always the extra cheapo Matter Cabalist, the best dotter in DAoC hands down, sporting AE DoTs, 2 stackable single target dots on the same line, nearsight, focus shield and pet recycle for power...
What Earth and Ice Theurgists need is a good nerf on Air specline and then maybe Mythic will give some love to those two lines...
Till there respec to air and go to Mid Frontier to farm RPs