How long do you plan to hold onto their data? Are you going to continue contact to ensure they're still interested? Are you burdening them to tell you repeatedly over the months down the road that they are still interested (or not)? Kinda like a newsletter they have to sign up for?

You are basically describing a head hunting operation. Connect with a head hunter and let them do the vetting, instead of wasting so many people's time for a job that is going to be 20 levels away.

You have the gig, or you don't. Or you're a headhunter for a single job that maybe might be available some time way out in the future. That would be a waste of everyone's time.