This is just a bunch a bitter whining because someone is perceived to be getting a better deal.
I can't speak for others who have expressed a similar view to mine, but can assure you I am neither bitter nor whining and understand all the arguments about off-peak, supply and demand, lesser playing rights etc.
I just think it's a little greyer than a black and white issue especially given how traditional membership models are not proving particularly robust at many places in these difficult times.
And I write as someone who has taken advantage of a more flexible scheme at my home club (not 5-day, but reduced fee, limited rounds) fully aware that while it is definitely in my best interests for my circumstances right now, it may or may not be in the best long-term interests of the club, although from what I understand, it seems to be going well for them at the moment