How much profit do they make from the lyrium they sell do the circle as compared to the cost of the lyrium they give to the templars? It's possible that the bulk of the lyrium goes to the templars while the lyrium sold to the mages pays for both the circle's use of it and the templar's. It is however possible that it doesn't. If it does then a strike would have some very sharp teeth as sustaining the templars would become a drain.
There is not enough information to base an argument off of except that there is not enough information to base an argument off of.
Just because the upper class are the only ones that can easily afford it doesn't mean others don't buy it. Look at the family sword from Redcliff the one a child wants to use to avenge his parents. Even if a person can't easily afford something that doesn't mean they won't invest in it. Anders and Anerin may not be working on behalf of the circle but those are also the only mages we see actively practicing healing magic. Other then that there is the codex on creation magic which mentions its demand. They're the only examples or closest thing to examples that we can draw information from.
When only certain classes of people can easily afford a good or service it does make them the primary consumer of those goods and services. People who can't afford a luxury, don't. And luxuries are pretty much what the Circle shops sell.
The fact that Anders and Anerin are not working on behalf of the Circles is all we need to know to invalidate them as examples of how the Circles work with healing.
In relative terms the lyrium trade is worth more then half the wealth of Orzammar. http://dragonage.wik...x_entry:_Lyrium Now what says I have to prove that the chantry gets the bulk of its wealth from selling the extremely valuable rare metal it controls the supply of anymore then someone who wants to say the chantry gets the bulk of its wealth from charity?
Nothing- both people who make the claim are obligated to support it. Can you support that the Chantry gets most of its money from Lyrium?
You've established Lyrium is valuable: that was not in question. That the Lyrium trade is half the wealth of Orzammar is interesting... but not particularly relevant because we're looking at a continental economy scale, rather than a single Dwarven kingdom.