I agree that I can't understand how jet.com will stay in business with their current shipping practices. I have ordered over 100 pounds of cat litter from them at below market prices all with free shipping.
Every other order I've had (3) something has been broken during shipping (as well as two of the cat litters) due to piss poor shipping practices. They put a whole bunch of stuff including crushable and fragile stuff along with bulky heavy stuff in one HUGE box. Of course all the bulky stuff crushed the fragile stuff, who thought that was a good idea? So they not only refunded the broken items but gave me $5 credit.
On top of that they gave 30% off my first order and 15-20% off the next few orders.
That's not a sustainable business.
They also had a couple of really good AMEX offers in the last six months but I don't know if they pay for that or AMEX does.