I always look up who these people are first:

Registrant:
ZDH Sales

3325 laurel oak st.
fort lauderdale fl, Florida 33312
United States

Registered through: GoDaddy.com, LLC (http://www.godaddy.com)
Domain Name: PROMOSCLASSEAFFAIRES.COM
Created on: 16-Aug-11
Expires on: 16-Aug-12
Last Updated on: 16-Aug-11

Administrative Contact:
hecht, zeev [email protected]
ZDH Sales
3325 laurel oak st.
fort lauderdale fl, Florida 33312
United States
+1.2162204588

Then I look up who the people are who are supposedly running it:
http://www.zdhsales.com/

Then I look up where the "business" is located:

http://www.homes.com/Home-Prices/ID-...LAUREL-OAK-ST/

or

http://www.zillow.com/homedetails/33...43220448_zpid/

For this one, I ask myself, "Why is someone running this business from a house in Florida"? "Why are they also running a telmarketing and outsourcing company?" "Why does their other webpage say they are located in Israel?"

A lot of these companies (and I don't know if this particular one is doing this) are purchasing FF miles and then booking award seats, that they are charging you for. This is against the rules of every FF program I know anything about, and if the airline finds out, your ticket will be cancelled.