it all depends on your level and skill , as a level 50 player atm , my biggest real income comes from pro movies and from booble, parlours are good but to get the real bucks you need all your hookers to be divine and keep them fully pimped , at lower levels and until i got my pro license my best income was cougars and booble , all my amateur films went to booble and with some advertisment i got a good buck out from it,cougars repeated service is also great source of income it doesn't add much at higher levels but still i can get up to 100k of 1 cougar , that i don't get from hookers or nighclub deals in one time,the most i got from a hooker with 100 sex appeal and a ring gifted to her adding 200% on her income was 69k from vladi the rich or whatever his name is, my advise stick to cougars until u get pro film license and start making those , make sure to get better girls as actress's as u go up in your pro films cause some genres will ask for higher sex appeal , good luck to you
forgot to say i currently have no points in intelligence at all which might be why i get lower bucks on john's list and night club deals , thats why i mentioned that it depends on skill points