The team that scored 30 runs had 43 rolls on the batter's card vs. 21 on the pitcher's card. A pretty good ratio there that will pretty much always mean a win, but 30 runs is amazing no matter how you do it.
The Cleveland Indians scored 22 on the Yankees in real life. So I do not think it is far fetched that either of those lineups could put up 30 runs. But it is still very impressive.