These are my stats Total Land: 19.590 Networth: $141.070.948
This doesn't take into account the 400+ turns I will miss by jumping early
I am mostly posting this to show how it is all about using your land and turns correctly. I know that 141m nw won't be top ten (although I have shown that this exact strat will get top ten easily if pushed hard enough). There is a very fine line between how high you get in networth and how high your expenses are... Your actual gross income is almost completely irrelevant if you balance out how much you are spending. This is the core of my strategy.

It actually works better if you play it at a little higher nw than i did but i stayed under 3m nw ALL set and you can see my grabs and things below...

Amount of Attacks you have Made: 45
Amount of Successful Attacks 43
Amount of Failed Attacks 2
Out of these attacks you made:
45 Standard Attacks
0 Ground Attacks
0 Air Attacks
0 Amphibious Assault
0 Bombing Runs
Spy Operations 60
Successful Spy Operations 43
Failed Spy Operations 17
Out of these Spy ops you made:
58 Obtain State Info Ops
0 Military Espionage Ops
0 Bomb Structures Ops
0 Attack Intelligence Centers Ops
0 Infiltrate Banks Ops
0 Sabotage Airbases Ops
0 Genocide Ops
0 Razing Ops
2 Inside trade information Ops
0 Infiltrate HQ Ops
0 Infiltrate Research Labs Ops
0 Infiltrate Government Ops
Times you have been Attacked 82
Attacks you Successfully Defended 8
Amount of Kills 0
Your Largest Landgrab 1.905