Worth... I dont realy don't really know what you mean...do mean. Do you pretend to sell enchanted spears after creating or what? Thats That's the only thing that could give you some "profit" if you want to use the sould soul points.
If not, it would be the same if you just bought mana potions and do spells that dont don't use soul points to level up.
I literaly literally would not train your magic level directly. If I were you I would only take the weekly training wands and kill yourself in the arena everytime every time you can to keep spending mana points... I know it doesnt doesn't help you as fast as anyone wanted...but if you are constant you will keep a good mlvl acording according to your level.