I have a close friend who seems to always try to take advantage of his social relationships with other people. He always tries to sell something to his friends (me included), borrow money from them, or asks them for help.
Every once in a while I have that problem too but a gamer friend of ours is someone who is a vendor for a large computer company. Every now and then we hear "Do you need a new monitor". That gets old, quick!
That stinks I know. Unfortunately, there are always people like that and we often have to deal with them. Just stay alert and never fall into their trap.
