We tend to make fun of those that buy them instead of making them.
We know that if we get found out and shot, it's our fault. If one buys one and gets shot, it's the manufacturer's fault.
Here's something to consider, paraphrasing from the attitude of the USMC Sniper Scout mentality: "Sniper's make their own ghillies because it falls onto their own shoulders if it it works or not. If you were a paratrooper, would you trust someone you don't know to pack your chute for you?"
Point being, an airsoft sniper is a rare breed, and a patient one. If you have the patience to make your own ghillie, make it well and adapt it to the areas you play in, then you might make it as an airsoft sniper. If you'd rather just buy a ghillie pre-made......................