I think in a sense marriage is slavery. I mean, you are bound to someone, and you have to serve them. The wrong idea is that it is bad in some way to serve another. Jesus said the greatest amoung you will be a servant of all.
Now for those outside the church. Man's nature is self serving. So serving another is a burden. When something doesn't seem profitable anymore cast it away. Ofcourse the more this mindset becomes widespread the farther earth decends.