I buy and sell skill-books, faction/deadspace/officer mods 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 20 traders in total, 3 on Jita, one each for mods, implants and skillbooks, the rest covering 17 different regions.
In September I made 34 billion after expenses. Down 6 billion from last month. I spent less time working the market including a 2 week period during the middle of the month where I hardly did anything.
Current net worth is 304 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. As I get bigger and spend less time updating individual orders I find myself carrying more and more of my net worth in sell orders. Very little is in assets I don't intend to sell soon, a few ships and some mods I keep in stock for my own use, maybe 4 billion in total.
That's my actual current total net worth, I don't pad the numbers by counting ISK I've earned but have since spent and no longer have. That'd be like calling myself a real life millionaire because I've earned over a million dollars during my life when the reality is I've never had anywhere near a million in total.