QUOTE(varst @ Nov 5 2011, 06:46)

\If I have to say, about 40 levels of ability boost should be enough.
That should be around 10k credits, and if you want more AP, you can go and buy some artifacts, which also have chance to give you primary attributes.
Um, when you get to around 40 levels, then each one costs about that much. But all together for the first 40 is pretty expensive. The time it takes to complete training helps though. usually if I do all my dailys and sell my unwanted equipment, I have enough for the next level. And if not, then the time it takes to finish training leaves you ample time to grind out some credits.
Oh and some one mentioned about not getting the exp boost because of proficiencys. Well thats not the reason I don't put any ap into that. Its because The longer it takes me to level up, the more credits I can obtain. It doesn't really seem that important though. But I like to make sure I can afford atleast one training for ap for each level.
Maybe when I have all the useful spells/buffs/debuffs, I'll spend credits and ap on exp.
Are the elemental resistances worth it btw? I don't really think so unless you have enough ap for everything. I mean, I have to get inferno and meteor maxed just to open up the the resistance slots. Even as a mage, I think its pretty useless to have 2 of the same elemental spells. Sure one would be cheaper to cast but thats 6 ap that can go towards anything else. Not only that, but it seems that most critters hardly ever use magic. But I guess if your level 527, no harm in getting them.