I have traded with gamesplz and bootyarcade and not yet working with smasingames. I had the same problem as you seemed like I was just not getting nothing if anything back. Now I must say both these guys go out of their way to work with me and I am nothing special. The script is just a tool and nothing more infact I don't even have one on my site yet. I use
Awstats and Google analytics: to see who is sending me traffic and how effective it is
1. A simple randout script combined with an Image script: To rotate good clean images under my games and send out some traffic that way. I open my traffic going to them in a new window UNFRAMED. so if anyone clicks the images below a game that is a point for me. This is nothing new and nothing spectacular just a one way to get more exits.
2. I built a what others are playing now at the top of my site: I can promo certain games and they will be added in amongst games that currently being played. This way I can add UNframed plugs to my site and send them out to booty and gamesplz. I want to send unframed because it will get me an impression for my ads and it will keep my site up so that maybe the player will comeback and click something else resulting in even more traffic going out.
3. I talk to the guys and if there is a problem with traffic trading both have been very upfront and honest with me. This is far from the end all of getting traffic to my site but it is another nice way to get some free traffic once everything is in place and I will be adding a traffic script over time as I do more of this to automate things some what but there is no such thing as set it and forget it with this I don't think.
Hey I don't have a big site but if you want to
trade some traffic with me then look at my thread listed above