It says 1 per customer, even if using multiple email addresses. How do you order multiple?
Most likely people are using different addresses, emails and/or using a VPN or something of the sort to change their IP in conjunction with different addresses and emails to bypass the 1 per customer limit.
On the topic of coupons, are there actually coupons out there that are greater than 50% of the value of the Z9? Ive only seen the $400 coupons around here and no amounts greater than $400.