KBM,
I have stayed out of this for a while but a quick point on the difference. Casper's is paying all of the clients expenses (Air, Travel, Food, Golf, etc.). In return, he is expecting a glowing article that will be published. If the article is not good enough, Casper will no longer invite the person and he will no longer get freebies from other people because he broke the implied contract. It is a whore's deal.
GD, GW and Golf are doing nothing of the sort. In GW's case, even if the course picked up the greens fee, I picked up Air, Room, Car, Food, something at the pro shop, etc. In addition, my rankings were private, so no one knew what I put. There is no implied contract nor any visable way of checking to be sure the course got a stellar review for the comp they gave me.
One last thing and it speaks to hard vs. soft costs. There are no hard costs involved in giving me a round of golf (You already have the course, carts, etc.). It does not cost the course anything to let me play. What Casper is doing involves real hard dollars (Airfare, Hotel Room, Food, Cars, etc.). If courses started offering to pick up the travel expenses of raters, than I would totally agree that they system is corrupt.