Essentially, ideas are a commodity and there's supposed to be no value in commodities, right?
What I've found though, is if your idea a) saves your audience time (like consolidating suppliers) or b) adds tangible value to your audience (like creating a new market segment) ideas elevate from commodities to valuable assets.
Next time you're prepping to pitch an idea highlight the ways your idea would meet the criteria above to your audience. You'll have greater success in selling ideas if you do.