Stealing may not be the right term, but we (the people mining at official merged pools) would get more nmc if it weren't for you, even if you pay out the earning to your miners.
Who gives a flying crap. If you can't compete then die. Sorry this is capitalism at its finest.
I don't use slush pool but your claims he took "your namecoins" are beyond pathetic. If your hashing power sucks so bad you can't compete then close up shop. You aren't entitled to any monopoly of namecoins.
As far as using test-net. Most of the issues w/ merge mining deal w/ large pool integration. It is kinda hard to find 100GH/s worth of hashing power willing to spend couple hours on test-net simultaneously for free.
Grow a pair and stop whining. If you think slush's test wass bad just wait I predict within a month most major pool will be merge mining (because miners will flow to those who are) so you can expect 5TH+ more competition.
I predict that once they have killed off the bitparking exchange dumping all them coins on it, merged mining will be dropped like a hot potato by them same weasels who have jumped on leaving namecoin in even worse shape than before.