Why do ppl complain about spending money or not getting their money back if they found the film they saw disappointing?

Hi folks (word "people" shortened to *ppl* to have the sentence fit into the thread opening line).

I understand of course that people count their money. I also understand that many of us watch films in order to enjoy them, be impressed by them, for the purpose of entertainment and often little or nothing else.

But I still can't help but wonder why so many people, in reviews and otherwise, complain about spending their money or (often in inventive and unrealistic ways) advise others to save their money to avoid seeing the film they may dislike or find disappointing.

And what if some of us are CURIOUS and actually WANT to see a film JUST to see how bad it REALLY is, but, not counting the times before the internet, they have no ability to find and watch it for free anywhere, on TV, online etc?

I mean, also, is money, even within the range of 5 to 10 dollars, like, in order to rent a movie even or watch at the cinema, really so incredibly precious to a lot of people even if they are NOT poor and can afford house payments and basic living?

And why do people go out and say stuff like "Oh, I only got myself to blame" and were disappointed that they had to pay for it. Or complain about not receiving their money back. BREAKING NEWS - you are not SUPPOSED to get your money back, you don't pay in order to ENJOY the movie, you pay to see it, watch it and come to your own conclusion on what you think of it, and it isn't the theatre's, video store's, let alone filmmakers RESPONSIBILITY on how and how much money you spend and certainly not their fault if you thought the film was bad, rubbish, disappointing etc.

What do you think, thanks.

P.S. Even a respected critic Mark Kermode complained about paying for a movie he didn't like. And someone once wrote that they didn't like "The Blair Witch Project" (1999) and theatre gave them their money back - but I doubt the latter one was true.