Our daycare is about 1/2 of my take home.
HOWEVER - I have a lot of pre-tax deductions. Health care, 401k, life insurance, social security, etc. DH is a 1099 and doesn't have healthcare. I also have a very flexible job and WAH.
So - it wasn't a choice, really, we needed to both work mainly for the health insurance (DH stayed home for a couple months between contracts, but that was with one kid and it was an...interesting experience

Regardless he enjoys working too.)
But the long term effects were a big factor too. Not only would we continue to contribute to social security and our 401ks, so that retirement savings would continue, but we also had insurance and job security. Seeing how our first kid was born in 2008, GOOD LUCK if I would have tried to pop back in the job market now or in the next couple years, when both my kids will be in school. (I am fairly risk averse, and couldn't handle relying on one income PLUS making my own situation less predictable).