History is replete with examples of wildly successful people who were initially told that their ideas whould not, or could not, work. Bill Gates and Rush Limbaugh are just two more recent examples.
Likewise, there have been ideas that were touted widely as "great" and they never got anywhere.
I've started two business (one in 1978 and one in circa 2000) both of which are still going after many years, and I never asked anyone if they thought I could succeed. Several of my "best friends" in fact told me my ideas would never see the light of day, yet I have since sold millions of dollars worth of them.
Coming from that perspective, I never recommend asking anyone. Either you KNOW it's a good idea that you can promote and sell simply because of your knowledge, personal experience and PASSION, or you should work for someone else. IN short; if you have to ask, the answer is probably "no".
Would I like to have a 36 cal Lemat? Sure. Would I pay near a thousand for one? Not sure.
But my opinion does not count, see. There are over 300 million people in this country. You need to have the attitude that you and you alone are going to turn a significant number of them to cap and ball shooters (even people who've never fired a gun) simply so they can buy your product-- because of how downright COOL it is. THAT's the attitude, my friend.