Is it because some of these paid tools return more results? But is lack of usable keywords really a problem? Is it because they list the "KEI"?
In a thread from last week called "Google Keyword Tool Versus Wordtracker" the user named "mald" (wordtracker employee) claimed that their traffic numbers are more accurate than Google's. Even if this is true, does that justify the price? (Feel free to chime in mald!)
Anyway, I really would appreciate any insight you guys have.
I take all traffic claims (Google's or anyone else's) with a grain of salt anyway; mostly I'm just looking for words or combinations I haven't thought of yet.