Yes!
After I had my oldest I absolutely dreaded the idea of returning to work, so I added up how much, approximately, having the baby would cost. Compared to what my husband was making at the time (which wasn't much--$22K annum) the baby wasn't going to cost anything. So why were we living paycheck to paycheck with two incomes before the baby? So I added up how much my husband and I were spending on ourselves. Kept every single receipt for one month, added up our bills, and looked it over with the hubby. We were horrified. In that instant, we stopped being adults (aka "kids who are allowed to smoke and drink") and became parents (aka "people who consider neighborhood association meetings to be free entertainment," aaka "people who consider a midnight drive to Meijers a legitimate vacation"). Never looked back. Never happier.