Despite being a prime member I think this is a very bad decision. 

Flexibility, and different ways are the key to giving members incentives. 

That is the problem with Daz's marketing...too many hoops to jump through.

It is too restrictive & awkward to appeal to customers.

I feel your current rewards points system works well. I found it very useful before I became a Prime member.

Don't restrict incentives to customers.

Keep it simple & equitable.

FWIW I find these days coupons seldom work anyway!

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Life is a beta.

In faecorum semper, solum profundum variat.