I've sold close to $1,000 on Craigslist in the last few months. Game systems, PC parts, dirt bike I had as a kid, headphones, ect.
If your 18+, run an eBay store. Go to auctions and storage auctions to buy a lot of treasures for a few hundred bucks. My Grandpa has done this since he retired and he makes close to $10,000 profit a month.
If you're taking porn seriously, make a site like XNXX or something with random vids. Make tons of money from ads and all.