I buy and sell faction/deadspace/officer mods, ships, skill-books and implants with traders covering all 5 main trade hubs (Jita, Amarr, Dodixie, Hek and Rens) plus secondary hubs in most other empire regions. I have 24 active traders, 3 on Jita (one each for mods, implants and skillbooks), 2 in another region, another 19 each covering a different region and a couple spare traders that are not actively trading.
In March, I spent an hour or two a day working the market and made a profit of 47 billion after expenses.
Current net worth is 506 billion with about half in cash and market escrow. Most of the rest is in sell orders and recently acquired stock I haven't gotten around to posting for sale yet. Very little is in assets I don't intend to sell soon, with maybe 4 billion worth of ships and mods I keep for my own use and a small stockpile of PLEX worth another 5-10 billion.
That's my actual current total net worth after expenses. It's how much I actually have right now, not just a running total of how much I've made (before expenses) over the course my Eve career. There's a big difference!
PS: I thought about posting an April Fools Day joke utilizing a 500 billion ISK sell order to break 1 trillion ISK. In the end I figured that'd be a little too obvious and an obvious joke just wasn't worth throwing 3.75 billion in broker fees down the drain for.