-Crim- has the better answer. I am a 324k pure spy, and it took me some time to convert, I recommend you to LC in a melee build (attack) and then slowly change each melee building to a guild lv.4, slowly advancing. You must have allies to get melee plunder so you get the money to convert.
Pure spy is a type of build, all guilds. However, there is also hansel build, where you have all your buildings spy, and one forge or subterranean factory.
Hum mele it to good stats if u got a spy freind whi opens switch em to spy build level 3 and leave one forge and farm freind get max kc switch guilds to level 4
You can self pin you can attack OSFs and make 10mil a hit with max plunder You can quest Three solid reasons.