@OP
I've participated in some campaigns in the past which were managed by Yahoo. I saw his selection of participants and I can say he is not bad in selecting participants.
The two posts you've mentioned is really not good but it's nothing wrong with Yahoo, it's just the owner's selection. Both DS and Yahoo confirmed it.
I would not use him for any campaigns.
Do you think Yahoo will work for your campaigns?
@AMN
You really made the post for Thule? I might say you have a great love for him. Nice Post!