Sounds like a really good idea actually. Like you said, parents might become overly involved and investors would probably hesitate a little. I'd like to be one of the people testing the toys myself; like Tom hanks in "Big".
I've often thought of applying for a job with say, Hasbro, and telling them I'm a big fan of some of their lines, then telling them where they hit and missed. I'm sure of they followed some of the boards they'd get a lot more feedback then their test groups could give.