No, i don't think thay are wasting their money, its just not as well spent as the ones on the bottem floor. Studies on fly numbers at ground vs canopy suggest that if you had too choose between the top and bottem floor (I'm not sure if building would impact on things however) the choice would be a very simple one.
I'm not suggesting hanging meat up high is the best option for keeping meat cool; just that its better than hanging it 1 foot of the ground in relation to flies. I don't have the time or the inclination to dredge up the research however i pressume plenty of factors play a role (still air and more chance of finding food or suitable egg laying resource on the ground). My point is, it's obviously not a 'fairytale'.
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