Amazon will not pay you to buy items through your own affiliate link, thus giving you a discount. But....If your family member, friends, etc were to buy the item from a different IP address, they will pay...If you get my drift...
Totally up to you though, as to what your morally open to doing.
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@cardisa is correct. This document very clearly states that you will not receive a commission from purchases through your link(s). It also forbids ordering products that you will use through your links even if friends or relatives make the purchase.