Lets say you had six dsl lines and wanted to aggregate them and feed them into a router to be 'load balanced' so to speak on a per session basis i.e. stateful basis. It doesn't have to split the bandwidth completely equally, a "good enough" solution is fine. A router with six wan ports would be an expensive option. Is there a cheaper solution? There are 200 users - so you could split them into groups of 50 and use 6 cheapo linksys boxes, but then if 10 people happen on one of the 50 user segments all downloading a huge file, they would get very slow internet, while the other 5 dsl links sit there unused.