It always comes down to finances for us.
As the main wage earner, it would be irresponsible of me to consider dropping my wage unless we could afford it. I'm not sure how we can. We don't have extravagant cars, a normal sized house/mortgage, we don't go on holiday, have lots of meals out, we don't smoke or drink, we have no debt. So WTF do we never have any bloody money?!
Okay, so the Next clothes don't help. But other than spending money on my children in the way of birthday/christmas, and clothes, we don't buy anything else! We get films for free
. Mine and DP's clothes are Primark, odd bits from New Look if I'm lucky. 
We don't even have any savings. Other than what I saved by working myself in to the ground while I was pregnant.
I guess everything is just more expensive. I suppose we are in the 'squeezed middle' or some such.
Oh, and the constant car repairs can't help either! And I'd like to say the house repairs, but I usually ignore what needs repairing til it's beyond hope. 