The biggest thing in my mind is if you buy direct from bitmain you have 90 day warranty. Warranty do not transfer so if you buy from ITOP you have no bitmain warranty, unless they are lying to bitmain and send it in as if they still owned it and did not sell it.
We provide the full warranty same as the manufacturer does for whatever products we resell , we charge a littlie bit more to cover the extra expense it may causes ,more payment options and better customer service .
How are you doing this though? Are you having customers send to you or sending to bitmain as if it was you?
Bitmain terms are here:
https://bitmain.zendesk.com/hc/en-us/articles/202661989-Limited-90-Day-Warranty-Terms- They clearly post: "it does not extend to owners of the product other than the original owner" and as first buyer and not official reseller you are original owner. They even warn of resellers may claim to have warranty that do not on sales "Some resellers may claim the units be qualified, however, it may not be."
Can you please show us documentation where Bitmain say's your not an official reseller yet you may transfer warrenty?