So I just gave this a try and have to completely disagree with this approach
Doing this didn't allow me to start researching Clinical Testing Procedure until Day 10, and I'm assuming it would take another 2-3 days before I'm actually selling it.
I started a third game using my guide - IE
Research Basic Medical Application
Create a Serum with BMA and purchase Batch Improvement
Set your Production to sell all but 1 Serum, take that one then Fix Prod to sell ALL
~Get a Supply and Production Girl~
Advance your Research with Steph by giving her that 1 Serum
Hire a Charisma Girl and bounce her between HR and Marketing as needed
Hire a Research Girl
This approach already FINISHED researching Clinical Testing Procedure on day 10, and my business is already generating $$. I had another $700 to spend (this is with having already purchased Batch Improvement).
I guess we can agree to disagree.
Finished researching Clinical Testing Procedure on day 10 on day 10 Evening (with 1 action remaining to create serum design)
However because of coming weekend and such was able to research serum at the end of day 14. (by that time I however have full stock of supplies - 250)
By the night of day 20 I have Batch1 purchased. Low on cash, but business is already on earning side.
But actually that does not matter. The key of the strategy is not the income. The key is personnel. I want to start hiring them when:
1) I can start hiring with 7s not 5s
2) I can hire girls with extra obedience and extra slutness
3) I know most of their preferences so I can choose ones with less dislikes/hates
4) not a necessity, but hiring is easier if you get 10 ppl instead of 3
So I deliberately slowing down the process of getting new employees. And the easiest way to earn money for personnel upgrades - make a start with procurement/production freak
Still it's a good feature of the game that there are different paths to glory (that we can use!)