To share everything for free? I would agree if what these people were giving back was of any value. If I posted a product and someone I knew on the forum for some time politely PM'd me an offer to review it, that would be welcome. What the OP is talking about here though is the same people "begging" blindly for every eBook up for sale.
Each member would be better off saying "Can I have a review for free" in their siggy. End of problem!!