In an attempt to make my homepage rank for the keyword "AA Speakers", almost every post on my website contains a link back to my homepage with "AA Speakers". Totally duplicated content, I understand, but if you look at an example post (of which i have over 6000), you can see that the content is really the recording and whatever comments visitors make (e.g., http://www.recoveryaudio.org/aa-speaker-tapes/tom-i-steps-12-primm-nv-2007-12-07
Would a few thousand instances of posts linking the focus keyword back to my homepage be considered spammy?
By the way, I might be interested in hiring someone in helping me make modifications to the site in order to capture the #1 ranking for AA Speakers (currently #3). It already holds over 150 #1 keyword rankings, but I can't seem to get the most valuable keyword above #3 (and this site is far superior to #1 & 2 in terms of usability and content)