Still, the OP is a reasonable question. I make that sort of adjustment to an historical league myself. The fact is that it is possible to get some really strange market sizes at the start of a league. I remember one in which Oakland was a larger market than NY. And adjusting things in moderation leads to results that feel more realistic.
I just didn't want to get into an explanation about why things can start out this way in a league (getting lazy, I guess
)