Psychology, ever heard of it? Expectations influence everything, if you want it or not. The issue is that you can't influence your expectations a lot. They're built by prior experiences and perception. You can try to temper them but you won't ever have them completely under control. The only people who can control your expectations are the ones in control of the product. If a person gets too high or low expectations it's entirely on the shoulders of marketing. There are of course exceptions if the expectations are based on outdated or wrong information, or are built on something that's just not realistically possible.
If I have the wrong expectations of a game and I did my due diligence in gathering information you can be damn straight that I'm gonna blame that on whoever was in control of marketing.
If you demand respect or gratitude for your volunteer work, you're doing volunteering wrong.
