If they want to do that, why can't they just get it OTC way or possible just make use of a local exchange rather than trying to use you as an intermediary. What is the point of you being an intermediary in this whole equation anyway? A lot of things sound shady in what you have said, and obviously being a newbie, for you to really think anyone would want to pay attention to you is actually something funny.

If I want to sell BTC, I know the proper channel to do so without having to take some unnecessary risk. If you are looking for real sellers, you should take a look at localbitcoin, you will find them there surplus.