Something I've been thinking recently is whether networks might assign multiple ids per publisher, so you receive traffic under different zone ids, but at the end its the same website, which would make blacklisting quiet tricky
If for example I blacklist a placement on a camp, can the network keep sending me traffic from that source, but under different id to pass the blacklist?
At some point bad quality websites will make their way into most advertisers blacklist, so the network will make less money from there, and might try to fix it by assigning a new id to it
I hope this is not a practice that the networks would do, but something I was thinking about...
Anyone experienced such thing?
Reputed network won't do it.
LeadCloak
As LeadCloack mentioned, reputable Networks won't engage in this behavior because it's not scale-able to sell bad traffic in the long run.
In
Hello,
To avoid this case I suggest using at least in two different macros - like pub-id+domain.
Then if the network will change the pub-id you will still see traffic from the same domains.

With some networks its the norm actually ... exoclick for example, you can have several zones on 1 website, these can be different banner sizes for example.
And whenever the publishers are allowed to create zones themselves, some will either screw it up and generate different codes and put them on the same website ... and some will do this on purpose, just to confuse advertisers and to make blacklisting more complicated.