i can't understand why you would feel used.
i've been here awhile, and seen a lot of folks come here in crisis. often, they have no church or christian support system, but they have enough of a christian background that they are inclined to seek views or support that are consistent with "christian". or maybe they are too embarrassed to go to their church for help. seriously, i could think of several possible scenarios.
and then, in their pain and hurt, or loneliness, or whatever emotional condition that is appropriate, the pour their hearts out.
by the time i find the thread/post, i read it. i determine whether i think i can add something to the post. sometimes i have an answer, but lack the emotional heart for it. other times, i read, but come back later.
usually in those problem threads, i will pray and post. or post and pray.
but make no mistake, we're not forced to do that. i look at most of those as an opportunity to serve others and be a blessing in someone's life. i think that it's always NICE to get some feedback, but more often, i know i'm just a tiny piece of God's plan in that person's life. : )