I won't enter into price of mages debate, I don't think i's the real issue...
Indeed, what will change in an Aby game if mages would cost 30% less ? Not much, as the Blood mages are capitol-only, you get 1/turn anyway - only difference is that you'll have on average maybe 1.5 Fire gem/turn more - you won't have to sell them due to cheaper prices...
Balance-wise it's very insignificant... Granted that's not true for Salamanders, and overall Aby would be richer, so have some more Salamanders as well as troops. But it still doesn't seem to me that a big deal.
OTOH making the basic Warlock Appr NOT capitol-only is a real deal, because it will allow much more effective BH by Aby - even if the mages are expensive ...
What about WA at 200 Gold but buildable everywhere ?
