this is not an example of validating your hypothesis. the question you should be asking is, "Do people want this service?" The people who want this service are the people in the 21-40 range. The people who don't know are not the people who need your service--they don't know because they don't care.
"How much would you pay for a tool that made you aware of updates in the open source software that you built your product on?"
Well first as you know peoples answers to this type of question is filled with false positives.
I think your service needs to be sold on an enterprise level to people who have a budget and can pay for it. People who use open source but also pay for and have the budget for solutions to problems.
