At least 5 reasons people say no to your idea

Seth Godin said 2 reasons people say no to your ideas are:

"It's been done before"
"It's never been done before"

Byron adds another:

“I didn’t think of it first.”

Mat Atkinson adds:

I think that there is a fourth:

“Good idea (but I don’t think you can do it).”

Prove ‘em wrong!

And I would add:

"You have a chicken and egg problem"

haha, you must think I am obsessed, I am just kidding really. I have never really made a list of reasons people say an idea won't work, probably uncountable.

I have business ideas quite often, I will share any here that seem promising or interesting. Dave Winer gives four here. My favourite and the only one that I think could work is:

2. I'd like to be able to pay a web company like Amazon or Google a one-time flat fee to host my content for perpetuity. I'd deposit my writing with them, on the web, and not worry about whether or not my heirs will keep paying the hosting bills to keep it alive. Today I'm hosting the weblog of my departed uncle (who I miss terribly!), I don't mind doing it, but what will happen when I pass? I'd gladly pay $10,000 to be sure my site and his survive my death. Long-lived institutions like Harvard University or Mount Auburn Cemetary (in Boston), even insurance companies, could get into this business. Think of it as a personal endowment, it would work like the money richer people leave behind as memorials to their own lives, or lives of loved ones.

The rest of course haven't been done before, done already, have chicken and egg issues and all of them definitly can't be done by you ;-).