I see people advertising their gigs where we go to request buyers

[ali_raza786]

How people do this .? how someone can be a buyer and seller at the same time for the same thing .?

have a look at the attached screen shot .

[inkpetal]

People who buy gigs from other people and sell them on are called “Flippers”, they buy for less and sell for more, it’s quite common. Annoying, but not illegal.