I guess Hashlet is about operational efficiency both for GAW and customers. GAW may choose whichever machines they want, pocket volumen discount and offer reasonable price. Why they offer cloud mining instead od doing mining for their own account?  Well, they are reseller ofmining equipment. This is their focus. Why they offer Zenpool to The customers? Because they make more money reselling mining equipment than.   they would by charging 2% of mining fee like multipools. I may be wrong but to me GAW sounds like well managed company knowing what they are doingand what they are good at.