I'm sure there are plenty of people who grew up contented in big families just as many only children felt neglected. Who can say?How many can you put through college?
My folks had 6 kids. They could afford all 6 kids, but does that mean it was a good idea? I know we didn't get the level of attention my daughter gets.
Based on my personal experience, more than 3 is too many. Regardless of money, the level of personal attention just isn't there. As a single mother, 14 kids will grow up neglected on a variety of levels.