In fact, it could be a good idea... but girls are for devs the way to make profits. Then one girl perhaps could cost 20 millions in order to be considered the time you need to save up.

Imagine that i generate 500.000 "game money" each day. 10 days i have 5 millions. 40 days 20 millions without using game money. 3 months more or less.

For devs girls are the product to generate money. They cannot give girls for free. And the cost should be very high.