No. I'm "combating" your posts because you're making tall assumptions about people you don't know based on your own set of values.
Disappointment is an absolutely natural and instinctive reaction when someone hopes something and that something doesn't happen. The extent of that disappointment depends on the individual.But also at the same time it's sad from all sides, in my opinion, to be upset in any way from being shut out.
You have no elements to judge if any individual wanted a free trial of the game or simply wanted to provide his feedback, or a mix of the two, so making generalizations or assumptions is a misrepresentation of people's character.
As some already told you, they supported (financially, morally and with their own creativity and ideas) the creation of A Realm Reborn since it was just an idea, and they feel the need to provide direct feedback so that the game is further shaped how they would like it to be.
Considering the undeniable fact that the later feedback is given, the less it'll have a chance to be effective and influential (as the more a MMORPG nears its release, the more its systems are fossilized upon each other giving less wiggle room for change), getting into the beta and being able to give feedback there may not be sufficient for many that supported the game since the beginning and until now, especially considering that they saw themselves excluded in favor of people that refused to provide that support (IE: they quit).
The fact that *other* people are providing their feedback (pushing the game towards what *they* would like it to be) has really no bearing to that, as quality in a MMORPG is largely subjective.
The fact that some people exist that just wanted a free demo doesn't mean that ALL are like that, making your assumptions quite void and honestly not exactly polite.
But hey, keep assuming if it makes your boat float.