hello
You can usually spot a garbage throwaway site by looking at it. You say their sites look good? That's a good sign. First rule is don't link to garbage.
If there's full contact info on the sites/emails that would be another good sign. Consider giving a phone call if that's provided. If you email, be sure to ask a question that requires a thoughtful answer.
Also, check their Alexa traffic rank. Ranks lower than 300,000 are pretty decent.
may this help you
-- This message may have been cut off and the rest will only be shown to members. To become a member, click here --