It’s the yoyo form of gambling. You put down your money and cross your fingers that a yoyo actually turns up. You win some, you lose some. 
Remember when poor old gNNY was trying to find out what happened to his order? It took him 7 months and an incredible amount of work and chasing-up before he finally received it:
I think Steve Brown said it best:
If they make it to YYE, then go ahead and buy one since they will guarantee you’ll receive it. However, if you value your time and money, do not attempt to buy these directly.