i have had generally decent results, both buying & selling on agon. i don't get too bothered about tire kickers or low ballers, when i am selling. ultimately, who cares? fortunately, when selling, i have not been plagued with "commitments" that never happen. i have also learned that if i see a fantastic price on something i want to buy, to yust accept the offer w/o making a counter-offer.
i admit to trying to buy low & sell high, but not because i am trying to make money, but i am yust trying not to lose too much when i think i will be likely yust buying something to try it. (speakers, amps & tuna fit in this category for me - this is stuff i like to try out in my own home.) and, i can ask a higher price, & accept a lower one w/o getting too burned on resale.
re: a-gon's forums, i used to be an active participant over there, but stopped years ago, due to their heavy-handed censorship.
doug s.