Also if the Aschen wouldn't be able to find the Wraith, they could visit a local tavern in Pegasus Galaxy by saying any condescending in general about the Wraith and leave.
But dropping a note by a "mistake" of the location for Aschen Prime.
Because the Aschen have proven to be lacking conscience.
Also with the help of the Aschen not only do many of the Tok'ra not trust the Tau'ri anymore, but also the Goa'uld were extinct much more sooner than before.