It's a shame some parents drop their kids off, so they can be selfish and lack the whole understanding of why they have kids.
I LOVE my kids and cherish EVERY moment I can spend with them. I miss them while I'm at work, and although I do admit it is nice to pass them off onto someone else for a while, I would never do it, for selfish reasons.
Don't get me wrong, my kids are great...but dang if they don't find my last nerve and jump all over it... ;)