Maybe title is not the best one. What I am asking is this: Can a host or admin redirect some traffic coming to some internal pages of a site from to time in a hard/imossible to detect way? Is it possible to check if some traffic goes elsewhere? For example alexa can show a list of related sites.. Something similar would be good. For example a paid version of alexa which shows more detail would be great.
You are asking if a host can siphon a few percent of your traffic and divert it to other sites? I am sure they could but whether they would is another matter. What makes you suspect this?