I believe a full price purchased product review VS a review of a product which generated little to no profit for Amazon (coupon code purchase) would help more with rankings.
Also of course a full price purchase itself should help rankings more than a discounted/coupon code purchase.
I would like to hear others opinions.
Also would there be a way when I request reviewers to send them the money to actually pay for the product instead of sending them a discount code?
How would reviewers feel about this?