well, IMHO. curse/wowi live on ads. I like these sites. I can zone out the ads and let these websites leech money off the ad-providers all they want.
Because I like these sites and because they live off the ads, I let them show up and load and dance in the corner all they want. This is because I can just ignore them. I find it hypocritical and ethically wrong to visit a site you support and use, yet deny them their ads.