I've apparently earned 43,823,045g in the marketplace, the most I've ever had in one go... about 9 million.
I would love to have my 'earned' amount right now... Imagine all the items I could take off my wishlist...
Total sales: 35,116,498 gold from 869 transactions.
I think the largest amount I ever had at once was 7+mil. But that all went away in one shot because I was saving up for Horns of the Demon, and as soon as I could afford 'em, I bought 'em and went right back down to zero.
If I even had the 35mil on me right now, I wouldn't know what to do with it. It might just sit there and build up. I don't often go on buying sprees.