Kickstarter has many advantages, one of which is 'free' marketing. The KS website acts as a hub for projects, nicely categorized, and easily accessible for the consumer. Also trust is an issue, KS is trusted enough to handle our payment information until the project is actually funded.
And let's not forget the website itself, if you think that building a (crowdsourcing) website is easy, your doing it wrong or you don't know what your talking about. The folks that run KS have as their core business their website, so it's in their best interest to have a save and efficient website. You as a startup or even established company don't have a website as your core business (with a few exceptions). Especially these days when laws regarding website and data security are established and can (in the near future) be heavily fined if security is deemed lacking and your customer information is hacked/stolen.
What's this CoolMiniOrNot website that was supposed to fund a removed KS project? Haven't heard anything about it, haven't seen anything about it, and can't find anything about it. The only projects I know about 'that CMON did are Zombicide and Sedition Wars, both on KS. And I seriously doubt that they would have been that successful if they were done on a private website instead of KS, the same goes for Ogre, Order of the Stick, Reaper Bones, etc.
The advantage of an established company/person/brand doing a KS is that customers are more then likely to actually get the product in their hands. A company knows how popular their product will be and what customers want to see through feedback. Just look at the Ogre boardgame, no way did the designer expect that many folks to want his old boardgame (as he admits). So we as customers get a better quality boardgame (more better stuff in the final box) and actually enough units to satisfy those who preordered and folks that want to buy one in a store. Heck, I wish that Games Workshop would do a KS for a plastic Thunderhawk (when I have the cash for it) ;-)
Now, don't get me wrong, I still expect projects to fail miserably after they are funded. But imho that risk is bigger in other categories, like video games, or tech products. The current biggest risk is the OUYA ($99 Android gaming console), currently has close to $6 million (and still 10 days to go).
I don't think that there are to many KS projects per se, as long there enough folks willing to fund them and get their promised products, it's a great system. The problem is the reporting on sites like these, each KS project has as much news 'value' on the main site as anything else, that is a mistake imho.