Paying customers that are clearly told something and then that something is not honored, have a right to be disappointed and frustrated. The extent of that disappointment and frustration can vary between individuals, but I see nothing wrong with it.
Company: "Only our paying customers are entitled to this product/service."
Paying customer: "Yay!"
*Company delivers product/service to people that aren't paying customers, while leaving out a large number of paying customers.
Paying customer: "WTF?!"
I would say frustration and disappointment are entirely justified, but hey, you're entitled to your own opinion.