Let Others Build Simple Web Sites, You List on Flippa, Sites Sell and You Pocket the Cash - Rinse, Repeat. Flipping web sites is nothing new. You can go ahead and build a web site and then turn around and sell it on Flippa.
Usually you need an established site that has some kind of decent traffic. There is actually a way to build web sites that have no traffic at all. You'll get a short (37 pages) PDF giving you step-by-step instruction.