I used them, but not for an arcade site, they were awful. With adsense PureFTA.com earns me mid $xx to mid $xxx daily, adbrite was lucky to hit $5. I think if people buy your adspace through Adbrite you get good pay, but until then you are displaying ads which get you 3-5 cents a click.
AdBrite is the best alternative for Adsense I used Adbrite now since last week after I received a warning from Adsense and as of today I got $0.34 cents for just 5 clicks with Adbrite. Also, with Adbrite you are 100% free of what to do with your site because with adsense you are under their "authoritarian rule"... Please don't get me wrong I love Adsense... I just could not use it for now. .
With Clicksor I was lucky to get a click a month on the arcade in my sig. Now with adbrite I get around 6-8 clicks a day. It doesn't pay very much per click but on rare occation I will get a click for around $1. I am looking for new CPC services now. But if you can't use adsense then I suggest AdBrite for now until you get find a good one.
adbrite not really a good option. but if u cant use ypn or adsense for some reason , its a good option along with clicksor .