I buy and sell faction/deadspace/officer mods, ships, skill-books and implants with traders covering all 5 major trade hubs (Jita, Amarr, Dodixie, Hek and Rens) plus secondary hubs in most other empire regions. I have 23 active traders, 3 on Jita (one each for mods, implants and skillbooks), 20 more with each covering a different region and a few more in training.
In January my net worth was up 50 billion after expenses.
For a change, this month I increased the amount of time I spent working the market. I spent 2-3 hours a day on all but a few days this month. 3 times as much work for less than 50% increased profit. That's pretty harsh diminishing returns on time spent.
Once you get big enough spending more time working the market has diminishing returns, the more hours spent at it, the less you make per hour.
Next month I'll probably go back to spending less time (an hour a day at the most) and working longer term trends again
Current net worth is 432 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, mostly ships and mods I keep in stock for my own use, maybe 4 billion worth and very recently a small stockpile of PLEX worth 5-10 billion.
That's my actual current total net worth, I don't pad the numbers by talking about profit made before expenses, adding that up as a running total and only mentioning expenses as an afterthought. My numbers are (and have always been) my actual current net worth after expenses.