@Lustig Andrei,
No one need ask for your view in order for you to give it. This a discussion forum. It hasn't stopped you in the past, why so modest now?
In any case, I agree with you, but the OP wasn't making the case that slavery is somehow acceptable because Jesus didn't specifically denounce it. He may have been playing with posters in this regard, but the essence of his post is that willing slavery (to the extent such a thing could exist) is not a bad thing.
Unfortunately he is viewing this notion of willing slavery through a prism of devout faith. First of all, being a slave to God is hardly the same as being a slave to Man, and secondly God doesn't want slaves.
A willing slave is, by definition, not a slave.