A company from India came up with this idea to enable architects to sell their designs online, If you wish to sell your designs online, create a free account with SketchSky - https://sketchsky.com
Once you've created your account go to https://sketchsky.com/seller/ and you'll become a seller! Voila!
Now upload your files in a .zip (example: your_file_name.zip) and set a price! You're done.
Start selling! Good Luck