As crazy it may sound I think many “buyers” are sending fake buyer requests just to make money.
In web development niche I see very weird request trending. Buyers are linking to crappy blogspot websites providing it as example for they request.
Most weird is that for those crappy websites they want to pay 1,000$ or even more. They get a lot of offers because sellers are thinking those are real offers, in may opinion those buyers are just providing free traffic for their website.
There are also buyer requests that provide website with shortened link URL as an example, and from let’s say 1000 visitors a guy who links that URL earns about 5-15$. Easy money.