Originally Posted by darksoul

Ok, I'll add something here for the sake of it.
Expired domains.
Theres about 30k domains expiring daily and 5k of those are adult.
You'd be surprised how many backlinks this domains have and they almost never
get removed.
Keep in mind you only need to make 1 sale a year (how hard is that ?) to be profitable.
SEO those sites a bit , add collection boxes as well and you'll make 2 sales a year.