People who ask you for advice that is freely given, and then when they get a great deal on something they try to sell it to you for 3 times what they paid for it. I'm not against making a profit, however; I think that is just trying to take advantage of people.
I'm a computer programmer who used to be a computer tech so I'm pretty knowledgable about the suckers. So when I do a side job for a company I expect to get a pretty good check out of it, but if I'm asked by an acquaintance for advice, within reason I give it freely. That is just like this board, some of you guys on here make your living by knowledge us amatures wish we had, and when we ask a question, thank goodness, you guys are willing to give that advice.
If I had given someone advice, then they offer to sell me something they got a great deal on for 3 times more than they paid for it, I'm sorry, I'm going to be insulted and well I think anyone should be.