Accepting Caladrius' deal as a City Elf?

Why? Why would you do such a horrible thing? It'd be like making a deal with Howe if you were a Cousland...

I haven't done it. I doubt I will, I don't have the willpower to be that evil in DA.

You're Tabris is a murderous traitor. 

She is. I role-play has as evil, remember. 

Is not evil and is not selfish either,it's just being pragmatic to be better prepared to defeat the blight.
Er.....I'm obviously joking, but sadly I know there are people out there that truly thinks this way.

I can't find adequate reasons for wanting to kill a parent in favor of a trivial reward promised by a man that was defeated and thus had little strenght to actually perform any valuable spell.Or are we gonna seriously belive that +1 constituiton makes that much of a difference? It isn't more valuable than receiving the help of the alienage elves at the end of the game,since +10 warriors for the end game is better than +1 constitution.

Whoa whoa whoa. You paid 100 sovereigns for a document, that you didn't even use?
Also man have I gotten this quest wrong in the past. I thought it was a choice of threes. Documents, gold or slaves. So I'll have to change my answer to nope, none of my wardens would pay 100 sovs for something they could pry out of his cold, dead hands. A constitution point on the other hand...

The warriors you're talking about, is it the ones with Shianni at the gates during the final battle?
Loaded up my Tildren save and somehow he managed to persuade them to fight for him (without a persuasion check) and it seemed to be as many elves fighting for him as there were in a video by some other player. And that player neither left Shianni with Vaughan nor sacrificed the elves. But then again, his save was pretty funky with dad coming back alive and stuff. 
Also loaded up the Caldrius option for fun and could convince him to give the letter for free, but Cal got to keep all the other stuff. But that was as far as Tildren could negotiate, since he can't intimidate his way out of a paper bag. (He just cuts himself out). 
But again, there was some funky business going on in that game. 

These evil options should have had consequences in the game,like the warden not being able to accuse Loghain of slavery because they themselves became guilty of the same crime,and maybe having some companions in the party(Zevran,Wynne, Leliana or Shale)who would damage the Warden at the Landsmeet by telling them what they did.Instead as usual the crimes of the player character are never addressed in the game,only Loghain......