I have worked with namedrive for a long times,and got over 20 dollars,but they delay the payment for 3 months.when I contacted they,they replyed my as follows: Unfortunately, for some reason our alternative advertising partners decided to not pay us for all the clicks made on your domains which are blocked with our primary adverting partner. Finally, they didn't pay! SCAM!
how long have you worked with them? Have you ever received payment? Is this one of those things where you park you domains and earn from ads? If so, have your 'earnings' jumped suddenly recently? It is 100% reasonable if there are alot of invalid clicks, or click bombing on ads that they wont pay out -> many times, the owners will get family / friends to click so they can earn. I would only consider it to be a scam if there are just gradual ad clicks over a long period of time. Just remember, some people will click-bomb your sites, just for fun, which sucks for advertisers and publishers alike. See if you can upload a few pics of your account, and support tickets etc. This will help others avoid making the same mistakes.
At least you deserve a detailed explanation if you have earned those honestly, "for some reason" can't be the answer.