This list is constructed with the basis of a at the SitePoint Forums, where users have posted which networks they have experienced that didn’t pay them. Some of these are very old, but it is something to keep in mind when choosing a network, and it would be a good idea to post on the forums to get recent feedback about a network and its reliability before you start displaying their ads.
UGO.com
My only bad experience was with UGO.com - I ran their popups for two months, and they owe me around $1000, but that was over two years ago, and I have a feeling I’ll never see those money. - Lars-Christian
AdWorldNetwork
BannerSpace
ValueAd
- OnlineGuide
TeknoSurf AdWave (Advertising.com)
TeknoSurf AdWave never sent one of my payments. They became Advertising.com in 2000 and shortly after I dropped my account. - Dan Grossman
BlueLithium
TMPexpress
One is BlueLithium (they replied to all of my mails and seemed professional) and now TMPexpress (they also replied all my mails but since last week no replies and no check received for jan 05. LoL, they are net-30 and it is deifinitely over 2 months now!) - umairmasood
small amount… - Netfusion
ValueAd.com
They suck. - emmzee
Bannerspace
Banner-Mania
ValueAd
SayByeBye
CompactBanners
Adlogix
aaddzz
AdOptimal
PopupAd.net
AdWorldNetWork
Could probably think of another 20 if I had time. - fireklown
