I just had a messed up idea... what about retail?
Retail store (end game)
You may buy a store (on the smallest lot) Must have walls,doors,1 bathroom ( both gender or 2 one male one female) Cash Register and a counter to put it on required by store lot.
You can not Restock! You can only sell your doubles. You are only allowed Clearance - 5% Markup, Sale - 15% Markup, Normal - 25% Markup only.
Construction costs 2000
Blueprints 1000
Reg skills
Level 7 Charisma
Level 8 handiness
Level 5 programing
Level 5 Writing
Level 6 logic
Your now a store owner now, you have to know "everything about your business, paper work, it computers, it clients and the shop itself. It is considered a family business and passed down should you wish to continue generations after home complete.