To get easy money, you have to use a text editor to edit the "bgruppen.dat" file in the "\1503 ad\data" folder. Find the following entries in the file:
Id: ALKOHOL
BauFirst: INFRA_STUFE_1C
Preis: 900
Bonus: 5, STEPPE|PRAERIE|DSCHUNGEL
PreisLevel: 0,5,10
Change the price ("preis") to "900" and your people will pay it.