Yeah, I got the achievement for 100k gold awhiiiile ago. I am already close to 200k gold right now. That is WITH spending 10k per training session at each level also. It doesn't help that I am Imperiall and have Imperial Luck... giving me the natural ability to find more gold than the other races.
Also I have a few things stored up but I mostly sell things right away. I have a weapons combo that I love (a sword that freezes and the Nightingale sword - freeze them then steal their health/stamina) and also a mace that absorbs souls. When I am getting low on refills for my two swords I just break out my mace and load up some more gems.

I also permanently wear the thieve's guild armor and some awesome elven boots that give me much more carrying capacity. I also usually have a companion that travels with me when I am trying to sell things or do minor quests. I usually make him/her hold my random heavy things.
I think Mauricio is the funniest companion. He makes fun of other players and has a very sarcastic sense of humor. He is a hired companion out of the pub in Riften!