Andy, your advise is like a drug dealer, pedaling a GC addiction.
Previously, my country "Scary beyond all reason," was my main country back from the mob war. I took a break for about a year, and when i returned, a previous ally sold it back to me.
Prior to buying it back, the previous owner sold population from their empire, and suffered the pop sale penalty. When i got it back, that stopped. How ever, as it was explained to me in an email from the Game Masters, the damage still remained, and it was pointed out to me that i had a pop bubble, that would go away, but it'd take "a long time,"
I figured that if the GM pop sales where uniform in how the age groups where distributed, it'd smooth over problem. But it only aggravated it. Even with 190 HI, their was no way i could afford the GC to keep the country afloat.
So, i came up with another plan. I dropped the HI to 90, that allowed the over stocked age group to decline at a much faster rate, realigning the average age, to being more inline with my other countries. And then just buying enough pop to maintain workers.
This took a little while, how ever, i was able to raise the HI to the 120-125 range. And at 170M population, was growing naturally. At a rate that most 40-50M countries would have a difficult time matching.
What your suggesting here, Andy, is that for some one to have a high pop country, they will have to buy the pop, buy the hospitals, then buy more and more hospitals to maintain the population. And still have to buy pop to maintain workers.
Sounds like GC addiction that can be by-passed with a little creativity.