TraffUp does not force anyone to view any site that you do not want. The viewer chooses which sites to visit. Human eyes are looking at your site, not a machine or robot or anything else. You can't even view you own sites, which would be a violation of Adsense.
What is the difference between Traffup and many other sites like lets just say Shetoldme, Redgage,Tweeter,Facebook; you place your links and people visit you site through them, just like in Traffup, but at TraffUp you are only allowed ten links max.
The only visible difference is that you pay to have your site link displayed, you either buy points or earn points. Which sites you decide to view is up to you.
Lets pretend that all of a sudden Shetoldme, Redgage and others, made you pay or get points too for displaying your links/site, then we would all stop using them?
I can understand if the visits were submitted automatically by a computer program or another software program, then I would have an issue, but when a person chooses to visit my link or your link and view it for how many seconds or minutes he or she chooses has no bearing on how they got there.
One is paying to advertise, nothing more, nor is anyone monetarily rewarded for visiting sites. I just buy points at 0.1 each.