I offer all of my models for free here: https://www.thingiverse.com/M3DM/designs
So the majority of my income comes from donations. I choose to do it this way because my favorite thing is to see people getting use out of my models.
I hope I can make your tabletop experience that much better :)
Benefits for donations are available on my Patreon. www.patreon.com/m3dm This is a subscription service, so the charge would reoccur each month.