One of the problems with ads is that they try to jump in front of me while I'm going about my business trying to do something else - it's the wrong time for a product recommendation in any case. I'm happy to go on sites like thewirecutter or cleverhiker when I want specific product recommendations for something. But that only works for products and product types that I already know about. If I could have an inbox of products that were likely to interest me, which I could check or ignore at my leisure (sorta like Spotify's Discover Weekly) - yes, I might just check that out, and even keep coming back if it kept giving good recommendations.