Why people respond saying I dont know ?

Great point! I hope that the people who need to see this pay attention. I'm sure a big reason is because they're greedy for money; it's easy to type in 3 words and move on to another 2 or 3 cents! Some people also think that they have to reply to all discussions started by their friends. If they would select friends carefully, then their discussions would have more interests in common; if not, they should not respond if they have no knowledge of or interest in a subject.

As other pointed out they are only after the money and want to move on to the next discussions as fast as possible, with so little words and typing speed they can answer to hundreds of discussions a day and make fast profit out of it, I think most of them from poor countries where a few US dollars a day means a lot, also most of them have very limited knowledge of English so they can't understand questions well or give a good reply even if they wanted too.. No matter what the excuses are, I think mylot should have tougher stand towards "quality" issues and delete much more spam than they are doing now.

some people are so caught up in responding to as much discussions that they don't care if they really have somethinhg to say about that particular topic,i think.money would be creditted to you if you respond to discussions .even if you don't know anything about the topic .so they just say something any get paid for that.

I don't know..... I'm just kidding, lol. Because they just want the points for posting rather than actually reading, thinking, and typing their thoughts...They are LAZY...lol.. They want something for nothing. It's hard weeding through some of the crazy stuff on here.

I think it is probably because when they respond they get money. Therefore the more I don't knows the more money they receive.