Letting Supply Drive Demand? Guest Submissions

So I write a newsletter called Steal My Idea, "where you can earn your purple belt in unqualified due diligence on made up ideas". Each issue is an in-depth, yet irreverently toned, deep dive on a business idea I think someone should create...subscription box for concert tees, netflix for homevideos, junk car marketplace...etc.

I'm wondering if opening it up to guest idea submissions would potentially help grow my audience. My thinking is that if someone submits an idea they are passionate about, and I write about it, they'll want to share it with their network, which will open my newsletter up to another audience and potentially result in more subscribers.

Has anyone tried something like this to get the flywheel going?

Here's a link so you can get a feel for it: https://www.stealmyidea.io/