Collecting bounties gives about 100 gold per job.
I think that's actually a great workaround to OP's problem

There are a bunch of radiant quests you can for money, many of which won't earn you a whole lot. Now I know that sounds bad, but it's better to be working (and therefore playing the game) for some honest money than having tens of thousands of gold coins you have nothing to do with. That, and I personally would like to make a character someday who works harder than just opening chests and looting corpses for Glass Swords of Valuable Enchantments.
Also, any bounties that call for fighting a dragon are worth 500 gold, I think. Are you against looting them? And don't forget the Companions (you can always deny radiant quests, like the brawl ones, if your character finds them unethical).
Edit: Oh crap, read over your original post and saw that you're looking to build Speech, not make money.
Well...in that case, I can't help you. Buy training?