If a program owner had several sites that were exclusively available to promote by invite only and they contacted you to promote these sites, would you actually sign up and start sending traffic to them?

I was just emailed by a company today and im not actually sure how i feel about it, on one-hand i kinda feel nice about being invited, but on the other, if everyone else isnt promoting them, how do i know that the program is trusted, stats work, etc, etc?

What would you do in this situation?

Regards,

Lee