This is my easiest way to get targeted suscribers in the IM niche.
1. Create a youtube channel for IM product reviews.
2. Create video reviews of each new product coming to the market, you dont need to get a review copy, you only need to talk about what people will get and show the sales letter for example.
3. Offer some cool bonuses "for free" you can offer something cool in exchange of emails, you will get lot of people optin in in order to get that freebie.
Most people offer bonus if people buy using their affiliate link, but you will offer something for free and will leave your link in the description.
You can also offer some paid bonus for people who wants to purchase the main product,
But if you offer something GOOD and FREE you will get many subscribers who you can sell after...
There you have.. you get the idea the sky is the limit here.