Just cashed out on my second sale with GOAT. Sold an NMD Mesh and a Black Infrared 6 (two often faked shoes). Was nervous with some of the stories here, but so far so good.
Also as a tip to new sellers, I recommend saving mailing boxes you get from Nike/Adidas, etc. Re-use them because they are very sturdy boxes (as long as they get to you in good condition). Save some of the packing material too. This will help against people using cheap/flimsy boxes or stuffing shoes into poorly sized boxes just to save on box costs. Also it's a good way to "recycle."