Make your ARG more realistic:
- Refer/embed [to] real places
- Refer/talk about [to] real activities
- Start a website they can access freely
- Start a website that requires a key/clue to access it
- Get a good artist to design your logo and webpages
- Suggest a website where they can discuss the ARG privately
- Set-up dropboxes/places all over the country that you are in
- Set-up a post office/UPS box
- If they give you real addresses send mail/express mail them with clues
- Advertise for “players” in craigslist, twitter, etc.
There are some tools you can use to make the ARG more real, for instance make a recording (youtube) of a person extolling the virtues of your product, etc.