OK, say I have a KS project and I give every Joe Schmoe that donates $20 developer forum access. Now I've got a huge group of Joe Schmoes all trying to tell me how to make my game. Guess what? I'm not going to listen to most of those Joe Schmoes. Again, your $20-$50 donation does not give you a voice in the development process. If the developer is stupid enough to think it does, then you already threw your money away on a shitty game.
Great argument, except that it's completely wrong because Endless Space doesn't suck at all. The other games I have dev access to are shaping up nicely as well and I'm excited to see how they turn out. My money did indeed give me a say in the development process and your "no, it didn't" claim is specious at best. Show me an instance where the developers refused to acknowledge the comments of people who paid to be a part of the process or something. I made actual suggestions about the user interface of ES that were implemented exactly as I described, and I voted on a number of changes to other elements proposed by other users that made it into the game. As a result, the game is better when compared with the earlier beta builds before changes were made.
Because, as I said before, Kickstarter is the monetization of indie gaming, which is a terribly unfortunate occurrence. Crowd-funding encourages greed and emotional manipulation, but the "shut up and take my money crowd" won't remove head from ass long enough to see it.
But how does that make a difference to you as the player? How does it affect your enjoyment of the final product in any way at all? You are still wearing the "businessman" or "economist" hat. Take it off and put on the "player" hat and tell me how the original funding source changes the product in a negative way. I have offered good evidence of how it has influenced games that I have played in a positive way, but all of your arguments rely on theoretical happenings that you are unable to back up with real examples. If something bad happened to you and you contributed to a project that failed, you can just come out and say it, it's not like anyone is going to hold it against you, and the actual evidence will help bolster your arguments.