I’d like to set up a gift system, but I have no idea how to effectively keep track of who stays.
Nothing. My new stuff is accessible to them 
Every now and then, I’ll feel “generous” and email rebillers an extra nude from photo sets I already had, with the caption “oo no one else gets to see these, oo lala” hahaha. They eat that stuff.
Renewal does nothing. It does not increase your revenue either; they simply turn it on and off the day before. Then they leave, so we basically simply give them more free time and content when they leave anyhow.
I’m considering about doing this as well; I have a spin the wheels game, so maybe I’ll develop one for renewers or offer discounts.
to be honest, No, i don’t