Didn't receive a call. Post card says make money EASY. I wanted to look ?now for possibility of ...no probability of scam before calling...and telling them there's no such thing as money for nothing. But my wife wants me to try.

This is the infamous postcard mailing SCAM.  It all involves getting "the gullible" to sign up for a phone app that is as useless as the "business."  Read here:
http://scamxposer.com/business-review/viral-postcard-system/

http://www.mailscamalert.com/home-businesses/postcard-mailing.html

https://www.consumer.ftc.gov/articles/0175-work-home-businesses

Forgot this one.  It's probably this guy or one of his offshoots.
http://reviewopedia.com/workathome/postcardprofits-com-a-scam/

Just another get rich quick scheme that does not work. Definitely a scam.