Affiliate deals with content sites - which are more than just advertising because they tend to have insane revenue sharing deals for the lifetime of the lead - often 50% split of membership fees for the life of the subscription.
So from just a single user signing up for a $30/month subscription, you would make over $180/year.
My partner enjoys a healthy secondary income (way way above the monthly figure mentioned in the original question) from such activity.
If you do big-data analysis and/or curation of content you can probably sell this to other sites too as many in this space are cash rich and tech-ability poor.
I've not because I don't actually have any projects in this space - my partner (Violet Blue) does and I help her with the technical side of her sites and as someone with a media/tech background I find a lot of it quite interesting.
So from just a single user signing up for a $30/month subscription, you would make over $180/year.
My partner enjoys a healthy secondary income (way way above the monthly figure mentioned in the original question) from such activity.
If you do big-data analysis and/or curation of content you can probably sell this to other sites too as many in this space are cash rich and tech-ability poor.