So for work we needed to start growing our email user base cheaply and in a targeted way.
I came up with a way to generate revenue and collect user details 'email, address, full name, age, mobile number' at a extremely low cost.
The campaign ran for 1 month and the results are great. We ended up collecting 7147 new users at a cost of £0.02 per subscriber.

The exciting part is that it can scalled up significantly and we also set-up a sales funnel which users are imported into directly and sent an email once per day for 30+ days. 'Going to expand on this'
The landing page and sales pitch could all be improved upon greatly and I am more than confident this can work in ANY niche.
£0.02 per user is amazing, so you basically gave away a software you paid £90 to build in exchange of user details?
Damn that is super impressive incentivized, or not. You have a lot of room to play with to get your ROI up!
What country was this for?
That is very impressive price per users info.
Care to share the niche?